A body of mass 30 kg is raised from the floor to a table height 1 meter. Relative to the ground, what is the potential energy of the body

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

A body is released from the top of a tower of height h meters. It takes t seconds to reach the ground. Where is the body at time t/2 seconds?

A man of mass 60 kg walks up to the top of a building of height 15 m. Calculate the increase in potential energy.

A spring balance is graduated from O to 16 kg. When is reads 16 kg the spring is stretched by 10 cm. A body suspended from the spring is found to oscillate vertically with a frequency 2 oscillations per second. What the weight of the body ?

A body of mass 1kg falls from the top of a cliff 50 m high and buries itself one metre deep in mud.Find the average resistance offered by a mud and the time of penetration.

A body is released from a height and falls freely. Another body is released exactly 1 sec later from the same height. The seperation between the two bodies, 2sec after the release of the second body is

A person trying to lose weight (dieter) lifts a 10 kg mass, one , thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated, (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 xx 10^7 J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?

The masses of two bodies are same. One is placed at the height of 10 m and the other is placed at the height of 20 m. Which one has more potential energy?

A body is allowed to fall from a height of 20 metres from the ground. How much time will take to reach the ground? What will be its velocity just a moment before hitting the ground?

A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m s^-1 to 3.5 m s^-1 in 25 s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force?