A 1 kg rock is at a height of 50 meters. what is its gravitational potential energy?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

How is the gravitational force related to the distance between two objects?

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?