A sled slides without friction down a small, ice-covered hill. If the sled starts from rest at the top of the hill, its speed at the bottom is 9.00 m/s.
(a) On a second run, the sled starts with a speed of 2.00 m/s at the top. When it reaches the bottom of the hill, find is its speed 11.0 m/s, more than 11.0 m/s, or less than 11.0 m/s?
(b) Evaluate the speed of the sled at the bottom of the hill after the second run.