In which item is energy stored in the form of gravitational potential energy?

1.a slice of bread

2.a compressed spring

3.an apple on a tree

4.a stretched bow string

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?