1).the power of a 100 kg man is 150 watt calculate the time taken by him to climb the height of 20 m.
2). how much energy is needed to kick a football of mass 500 gm with the velocity 72 km per hour .

3). an electric bulb is marked 100 watt how much electrical energy is consumed by it if it is glowed for 2 hours .

4).a person of mass 60 kg is running with the velocity of 20 metre per second what is his power if he completes the race in 30 seconds .

5).A ball is dropped from a height of 5 M and its rebounds back up to the height of 3 M calculate its
a).kinetic energy when it strikes the ground .
b).kinetic energy when it leaves the ground for rebounding .​