posted by Joe .
no idea all HELP appreciated!!
A shot-putter puts a shot (weight = 70.3 N) that leaves his hand at distance of 1.45 m above the ground.
(a) Find the work done by the gravitation force when the shot has risen to a height of 2.15 m above the ground. Include the correct sign for work.
(b) Determine the change (ÄPE = PEf - PE0) in the gravitational potential energy of the shot.