A skier starts from rest at the top of a 45 m hill, skies down a 30^o incline into a valley, and continues up a hill on the other side of the valley. Botb hulls are measured from the valley floor. Assume you can neglect friction.

a. How fast is the skier moving at the bottom of the valley?

b. If the skier resches the top of the second hill with a speed of 4m/s how tall is the hill?​