A body of mass 4 kg is projected at 3.3 m/s up the line of greatest slope of a smooth inclined plane. Using the work-energy principle, find the work done by the body’s weight from the start of its motion until it came to a momentary rest.
A body of mass 15 kg fell from a height of 15 m above the ground. Using the work-energy principle, find its kinetic energy just before it hit the ground. Consider the acceleration due to gravity to be 9.8 m/s2 .
A particle of mass 100 g was projected vertically upwards at 20 m/s from a point on the ground. Use the work-energy principle to calculate its kinetic energy when it was at a height of 14 m above the ground. Take .
A car of mass 920 kg was moving along a horizontal section of road. The driver applied brakes when it was travelling 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.
The driver of a car of mass 1 056 kg was approaching some traffic lights at 14 m/s. The lights turned red so he started braking to bring the car to a stop. The brakes applied a constant force of 128 kg-wt. Using the work-energy principle, determine the distance covered by the car until it came to rest. Consider the acceleration due to gravity to be .