Why does a tunnis ball bounce heigher on a hill than on plains?

Why does a tennis ball bounce higher on hills than on plains?

Why does a tennis ball bounce higher on hills than in plains ?

Why a tennis ball bounces higher on hills than in plain?

Why does rubber ball bounce greater heights on hills than

A tennis ball jumps higher at hills than at planes. Explain.

Why has the National Forest Commission of India recommended a relatively larger forest cover for hills than for plains?

Why has the National Forest Commission of India recommended a relatively larger forest cover for hills than for plains?