Question

Explain the following
a) an object increases it's energy when raised through a height.

Answer 1

The mass may already have some PE, depending on itselevation in the gravitational field. The potential energyof body increases with height. Hence with increase in height it also increases.

Answer 2

this is because work is done by on it against gravity while it is being raised. the energy present in such an object is called gravitational potential energy