148819 A force of $20 \mathrm{~N}$ acts on a body of mass $2 \mathrm{~kg}$ initially at rest. Find the work done in $2 \mathrm{~s}$.

148820 A car of masses $1500 \mathrm{~kg}$ is lifted up a distance of $30 \mathrm{~m}$ by crane $A$ in 0.5 minutes. The second crane $B$ does the same job in 1 minute. The ratio of their powers is

148821 A force $F_{x}$ acts on a particle such that its position $x$ changes as shown in the figure.

The work done by the particle as it moves from $\mathbf{x}=\mathbf{0}$ to $20 \mathrm{~m}$ is

148822 A rod $A B$ of mass $10 \mathrm{~kg}$ and length $4 \mathrm{~m}$ rests on a horizontal floor with end $A$ fixed so as to rotate it in vertical plane about perpendicular axis passing through $A$. If the work done on the rod is $100 \mathrm{~J}$, the height to which the end $B$ be raised vertically above the floor is

148819 A force of $20 \mathrm{~N}$ acts on a body of mass $2 \mathrm{~kg}$ initially at rest. Find the work done in $2 \mathrm{~s}$.

148820 A car of masses $1500 \mathrm{~kg}$ is lifted up a distance of $30 \mathrm{~m}$ by crane $A$ in 0.5 minutes. The second crane $B$ does the same job in 1 minute. The ratio of their powers is

148821 A force $F_{x}$ acts on a particle such that its position $x$ changes as shown in the figure.

The work done by the particle as it moves from $\mathbf{x}=\mathbf{0}$ to $20 \mathrm{~m}$ is

148822 A rod $A B$ of mass $10 \mathrm{~kg}$ and length $4 \mathrm{~m}$ rests on a horizontal floor with end $A$ fixed so as to rotate it in vertical plane about perpendicular axis passing through $A$. If the work done on the rod is $100 \mathrm{~J}$, the height to which the end $B$ be raised vertically above the floor is

148819 A force of $20 \mathrm{~N}$ acts on a body of mass $2 \mathrm{~kg}$ initially at rest. Find the work done in $2 \mathrm{~s}$.

148820 A car of masses $1500 \mathrm{~kg}$ is lifted up a distance of $30 \mathrm{~m}$ by crane $A$ in 0.5 minutes. The second crane $B$ does the same job in 1 minute. The ratio of their powers is

148821 A force $F_{x}$ acts on a particle such that its position $x$ changes as shown in the figure.

The work done by the particle as it moves from $\mathbf{x}=\mathbf{0}$ to $20 \mathrm{~m}$ is

148822 A rod $A B$ of mass $10 \mathrm{~kg}$ and length $4 \mathrm{~m}$ rests on a horizontal floor with end $A$ fixed so as to rotate it in vertical plane about perpendicular axis passing through $A$. If the work done on the rod is $100 \mathrm{~J}$, the height to which the end $B$ be raised vertically above the floor is

148819 A force of $20 \mathrm{~N}$ acts on a body of mass $2 \mathrm{~kg}$ initially at rest. Find the work done in $2 \mathrm{~s}$.

148820 A car of masses $1500 \mathrm{~kg}$ is lifted up a distance of $30 \mathrm{~m}$ by crane $A$ in 0.5 minutes. The second crane $B$ does the same job in 1 minute. The ratio of their powers is

148821 A force $F_{x}$ acts on a particle such that its position $x$ changes as shown in the figure.

The work done by the particle as it moves from $\mathbf{x}=\mathbf{0}$ to $20 \mathrm{~m}$ is

148822 A rod $A B$ of mass $10 \mathrm{~kg}$ and length $4 \mathrm{~m}$ rests on a horizontal floor with end $A$ fixed so as to rotate it in vertical plane about perpendicular axis passing through $A$. If the work done on the rod is $100 \mathrm{~J}$, the height to which the end $B$ be raised vertically above the floor is