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##### In which case is more work done? When a 50 \mathrm{~kg} bag of books is lifted through 30 \mathrm{~cm} or when a 50 \mathrm{~kg} create is pushed through 2 \mathrm{~m} across the floor with a force of 50 \mathrm{~N} ?

A car mass 800 \mathrm{~kg} traveling at 54 \mathrm{kmh}^{-1} is brought to rest in 60 meters. Find the average retarding force on the car. What has happened to original kinetic energy?

An object has 1 \mathrm{~J} of potential energy. Explain what does it mean?

When a rocket re-enters the atmosphere its nose cone becomes very hot. Where does this heat energy come from?

6.6 Define K.E. and derive its relation.

6.10 An electric motor of 1 \mathrm{hp} is used to run water pump. The water pump takes 10 minutes to fill an overhead tank. The tank has a capacity of 800 litres and height of 15 \mathrm{~m} . Find the actual work done by the electric motor to fill the tank. Also find the efficiency of the system.

What sort of energy is in the following:(b) Water in a high dam