Practice question based on chapter3 energy

 1. AN object is raised to a height of 10 m above ground of mass 50 kg. If the object is allowed to fall down then find its kinetic energy when it is just about to touch the ground?

2. State different units of energy. How they are related to each other?

3. Explain how molecules ability to do work  get affected while heating and cooling?

4. Establish the relationship between kilowatt hour  and the SI unit of energy.

5.A car triples his speed. How will his kinetic energy change? Show it with the help of mathematical calculations.