Atennis ball is dropped from 1.43 m above the
ground. it rebounds to a height of 0.945 m.
with what velocity does it hit the ground?
the acceleration of gravity is 9.8 m/s
2
(let
down be negative.)
answer in units of m/s

me and physics just aren't clicking unlike my other classes, so any place to find extra would be great!

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

What is a subatomic particle with a negative charge and very little mass?