A sled of mass rests on a horizontal snow track

PHYSICS · Subjective · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

A sled of mass

5\,\text{kg}

rests on a horizontal snow track. It is pulled by two students who together exert a constant horizontal force of

12\,\text{N}

on the sled. A constant frictional force of

2\,\text{N}

acts opposite to the motion. The sled starts from rest and moves

15\,\text{m}

along the track. (i) Calculate the net work done on the sled during this motion. (ii) Determine the speed of the sled after it has moved

15\,\text{m}

. (iii) If the same amount of net work were done on another sled of mass

10\,\text{kg}

starting from rest, what would be its speed at the end of the

15\,\text{m}

distance?