A ball is launched upward at an initial speed of 3 m/s. How high did the ball move if it took 4 seconds for the ball to reach its maximum height?

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

Ahorizontal force of 400.0 n is required to pull a 1760 n truck across the floor at a constant speed. find the coefficient of sliding friction.

How to know which equation of motion to use where?explain