270136 \(n\) balls each of mass \(m\) impinge elastically in each second on a surface with velocity \(u\). The average force experienced by the surface will be

270137 A ball reaches a racket at \(60 \mathrm{~m} / \mathrm{s}\) along \(+X\) direction, and leaves the racket in the opposite direction with the same speed. Assuming that the mass of the ball as \(50 \mathrm{gm}\) and the contact time is 0.02 second, the force exerted by the racket on the ball is

270138 ' \(\mathbf{P}\) ' and ' \(Q\) ' horizontally push in the same direction a \(1200 \mathrm{~kg}\) crate. ' \(P\) ' pushes with a force of 500 newton and ' \(Q\) ' pushes with a force of 300 newton. If a frictional force provides 200 newton of resistance, what is the acceleration of the crate?

270139 A ball of mass ' \(m\) ' moves normal to a wall with a velocity ' \(u\) ' and rebounds with a velocity ' \(v\) '. The change in momentum of the ball during the rebounding is

270140 If a force of \(250 \mathrm{~N}\) acts on a body,the momentum required is \(125 \mathrm{kgms}^{-1}\). The period for which the force acts on the body is

270136 \(n\) balls each of mass \(m\) impinge elastically in each second on a surface with velocity \(u\). The average force experienced by the surface will be

270137 A ball reaches a racket at \(60 \mathrm{~m} / \mathrm{s}\) along \(+X\) direction, and leaves the racket in the opposite direction with the same speed. Assuming that the mass of the ball as \(50 \mathrm{gm}\) and the contact time is 0.02 second, the force exerted by the racket on the ball is

270138 ' \(\mathbf{P}\) ' and ' \(Q\) ' horizontally push in the same direction a \(1200 \mathrm{~kg}\) crate. ' \(P\) ' pushes with a force of 500 newton and ' \(Q\) ' pushes with a force of 300 newton. If a frictional force provides 200 newton of resistance, what is the acceleration of the crate?

270139 A ball of mass ' \(m\) ' moves normal to a wall with a velocity ' \(u\) ' and rebounds with a velocity ' \(v\) '. The change in momentum of the ball during the rebounding is

270140 If a force of \(250 \mathrm{~N}\) acts on a body,the momentum required is \(125 \mathrm{kgms}^{-1}\). The period for which the force acts on the body is

270136 \(n\) balls each of mass \(m\) impinge elastically in each second on a surface with velocity \(u\). The average force experienced by the surface will be

270137 A ball reaches a racket at \(60 \mathrm{~m} / \mathrm{s}\) along \(+X\) direction, and leaves the racket in the opposite direction with the same speed. Assuming that the mass of the ball as \(50 \mathrm{gm}\) and the contact time is 0.02 second, the force exerted by the racket on the ball is

270138 ' \(\mathbf{P}\) ' and ' \(Q\) ' horizontally push in the same direction a \(1200 \mathrm{~kg}\) crate. ' \(P\) ' pushes with a force of 500 newton and ' \(Q\) ' pushes with a force of 300 newton. If a frictional force provides 200 newton of resistance, what is the acceleration of the crate?

270139 A ball of mass ' \(m\) ' moves normal to a wall with a velocity ' \(u\) ' and rebounds with a velocity ' \(v\) '. The change in momentum of the ball during the rebounding is

270140 If a force of \(250 \mathrm{~N}\) acts on a body,the momentum required is \(125 \mathrm{kgms}^{-1}\). The period for which the force acts on the body is

270136 \(n\) balls each of mass \(m\) impinge elastically in each second on a surface with velocity \(u\). The average force experienced by the surface will be

270137 A ball reaches a racket at \(60 \mathrm{~m} / \mathrm{s}\) along \(+X\) direction, and leaves the racket in the opposite direction with the same speed. Assuming that the mass of the ball as \(50 \mathrm{gm}\) and the contact time is 0.02 second, the force exerted by the racket on the ball is

270138 ' \(\mathbf{P}\) ' and ' \(Q\) ' horizontally push in the same direction a \(1200 \mathrm{~kg}\) crate. ' \(P\) ' pushes with a force of 500 newton and ' \(Q\) ' pushes with a force of 300 newton. If a frictional force provides 200 newton of resistance, what is the acceleration of the crate?

270139 A ball of mass ' \(m\) ' moves normal to a wall with a velocity ' \(u\) ' and rebounds with a velocity ' \(v\) '. The change in momentum of the ball during the rebounding is

270140 If a force of \(250 \mathrm{~N}\) acts on a body,the momentum required is \(125 \mathrm{kgms}^{-1}\). The period for which the force acts on the body is

270136 \(n\) balls each of mass \(m\) impinge elastically in each second on a surface with velocity \(u\). The average force experienced by the surface will be

270137 A ball reaches a racket at \(60 \mathrm{~m} / \mathrm{s}\) along \(+X\) direction, and leaves the racket in the opposite direction with the same speed. Assuming that the mass of the ball as \(50 \mathrm{gm}\) and the contact time is 0.02 second, the force exerted by the racket on the ball is

270138 ' \(\mathbf{P}\) ' and ' \(Q\) ' horizontally push in the same direction a \(1200 \mathrm{~kg}\) crate. ' \(P\) ' pushes with a force of 500 newton and ' \(Q\) ' pushes with a force of 300 newton. If a frictional force provides 200 newton of resistance, what is the acceleration of the crate?

270139 A ball of mass ' \(m\) ' moves normal to a wall with a velocity ' \(u\) ' and rebounds with a velocity ' \(v\) '. The change in momentum of the ball during the rebounding is

270140 If a force of \(250 \mathrm{~N}\) acts on a body,the momentum required is \(125 \mathrm{kgms}^{-1}\). The period for which the force acts on the body is