Question

a baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of 5kg whats the energy the carriage has?

Answer 1

The first thing you should remember is that the energy in this case will be given by the work done.
 The work is defined as:
 W = F * d
 Where
 F = Force
 d = displacement.
 Calculate it. 
 5 kg x 9.8 m / s ^ 2 x 21 m = 1029 J