physics
posted by sabeen .
You are pulling your sister on a sled to the top of a 20.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at an angle of 45.0° to the hill. If you pull from the bottom to the top, what will the speed of the sled be when you reach the top? answer in m/s.

well, the pulling force in the direction up the hill is 127N*cos45.
KE at top=127Cos45*20/sin10 50*g*20
solve for veloicyt from KE.