A car of mass 920 kg was moving along a horizontal section of road. The driver applied brakes when it was traveling at 54 km/h. Given that it came to a stop after covering a distance of 30 m, find the work done by the brakes over this distance.
A ring of mass 1.5 kg was sliding down a vertical pole. Starting from rest, it accelerated over a distance of 3.3 m until its speed became 6.2 m/s. Using the work-energy principle, determine the work done by the resistance to the ring’s motion. Take .
A body started moving from rest from the top of a ramp that is 312 cm long which was inclined at to the horizontal. When it reached the bottom, it continued moving on a horizontal plane. The resistance to the body’s motion is constant on both the ramp and the plane and equal to times the weight of the body. Determine the distance that the body covered on the horizontal plane until it came to rest.