148743 A force of $10 \mathrm{~N}$ acts on a mass of $20 \mathrm{~kg}$ which initially is at rest. Find the work done by the force during the first 3 seconds of motion.

148744 A body of mass $3 \mathrm{~kg}$ is under a force, which causes a displacement in the body given by $s=\frac{t^{3}}{3}$ (in meters). Find the work done by the force in the first 2 seconds.

148745 A body of mass $8 \mathrm{~kg}$. under the action of a force, is displaced according to the equation $s=\frac{t^{2}}{4} m$, where ' $t$ ' is the time. Find the work done by the force in the first $\mathbf{4}$ seconds.

148746 Match the following?
| Column - I | Column-II |
| :--- | :--- |
| (a) $\mathbf{F}_{\text {net }}$ | (i) $\frac{\mathrm{dK}}{\mathrm{dt}}$ |
| (b) $\mathbf{F}_{\text {cons }}$ | (ii) $\Delta \mathrm{U}+\Delta \mathrm{K}$ |
| (c) $\sum \mathrm{W}_{\text {non-cons }}$ | (iii) $\frac{-\mathrm{dU}}{\mathrm{dx}}$ |
| (d) Power | (iv) $\frac{\mathrm{dP}}{\mathrm{dt}}$ |

148743 A force of $10 \mathrm{~N}$ acts on a mass of $20 \mathrm{~kg}$ which initially is at rest. Find the work done by the force during the first 3 seconds of motion.

148744 A body of mass $3 \mathrm{~kg}$ is under a force, which causes a displacement in the body given by $s=\frac{t^{3}}{3}$ (in meters). Find the work done by the force in the first 2 seconds.

148745 A body of mass $8 \mathrm{~kg}$. under the action of a force, is displaced according to the equation $s=\frac{t^{2}}{4} m$, where ' $t$ ' is the time. Find the work done by the force in the first $\mathbf{4}$ seconds.

148746 Match the following?
| Column - I | Column-II |
| :--- | :--- |
| (a) $\mathbf{F}_{\text {net }}$ | (i) $\frac{\mathrm{dK}}{\mathrm{dt}}$ |
| (b) $\mathbf{F}_{\text {cons }}$ | (ii) $\Delta \mathrm{U}+\Delta \mathrm{K}$ |
| (c) $\sum \mathrm{W}_{\text {non-cons }}$ | (iii) $\frac{-\mathrm{dU}}{\mathrm{dx}}$ |
| (d) Power | (iv) $\frac{\mathrm{dP}}{\mathrm{dt}}$ |

148743 A force of $10 \mathrm{~N}$ acts on a mass of $20 \mathrm{~kg}$ which initially is at rest. Find the work done by the force during the first 3 seconds of motion.

148744 A body of mass $3 \mathrm{~kg}$ is under a force, which causes a displacement in the body given by $s=\frac{t^{3}}{3}$ (in meters). Find the work done by the force in the first 2 seconds.

148745 A body of mass $8 \mathrm{~kg}$. under the action of a force, is displaced according to the equation $s=\frac{t^{2}}{4} m$, where ' $t$ ' is the time. Find the work done by the force in the first $\mathbf{4}$ seconds.

148746 Match the following?
| Column - I | Column-II |
| :--- | :--- |
| (a) $\mathbf{F}_{\text {net }}$ | (i) $\frac{\mathrm{dK}}{\mathrm{dt}}$ |
| (b) $\mathbf{F}_{\text {cons }}$ | (ii) $\Delta \mathrm{U}+\Delta \mathrm{K}$ |
| (c) $\sum \mathrm{W}_{\text {non-cons }}$ | (iii) $\frac{-\mathrm{dU}}{\mathrm{dx}}$ |
| (d) Power | (iv) $\frac{\mathrm{dP}}{\mathrm{dt}}$ |

148743 A force of $10 \mathrm{~N}$ acts on a mass of $20 \mathrm{~kg}$ which initially is at rest. Find the work done by the force during the first 3 seconds of motion.

148744 A body of mass $3 \mathrm{~kg}$ is under a force, which causes a displacement in the body given by $s=\frac{t^{3}}{3}$ (in meters). Find the work done by the force in the first 2 seconds.

148745 A body of mass $8 \mathrm{~kg}$. under the action of a force, is displaced according to the equation $s=\frac{t^{2}}{4} m$, where ' $t$ ' is the time. Find the work done by the force in the first $\mathbf{4}$ seconds.

148746 Match the following?
| Column - I | Column-II |
| :--- | :--- |
| (a) $\mathbf{F}_{\text {net }}$ | (i) $\frac{\mathrm{dK}}{\mathrm{dt}}$ |
| (b) $\mathbf{F}_{\text {cons }}$ | (ii) $\Delta \mathrm{U}+\Delta \mathrm{K}$ |
| (c) $\sum \mathrm{W}_{\text {non-cons }}$ | (iii) $\frac{-\mathrm{dU}}{\mathrm{dx}}$ |
| (d) Power | (iv) $\frac{\mathrm{dP}}{\mathrm{dt}}$ |