Question

how to find gpe of tennis ball

Answer 1

Gravitational potential energy (GPE) is the
energy gained by an object as its height above ground level increases. An object's GPE is determined using this formula:

GPE = height x weight

Objects that are the same weight will gain more GPE the higher they
are positioned. If one object is heavier than the other at the same
height, the heavier object will have more GPE.

Answer 2

more properly, \(GPE = m*g*h\), where the mass MUST BE in kg, g is the acceleration due to gravity and the height MUST BE in meters