A sled slides down a small ice- covered hill(no friction). If thesled starts from rest at the top of the hill, ts speed at thebottom is 7.5 m/s/ On a second run, the sled starts with an initialspeed of 1.5 m/s at the top.
a) What is the speed of the sled at the bottom of the hill afterthe second run?
b) What is the height of the hill?