Mr. Doyle is pulling his friend up a 25.0° hill in a sled. He is pulling with a force of 676 N at an angle of 30.0° to the incline. The sled starts from rest and has an acceleration of 1.24m/s^2. If the normal force is 328.8 N, what is the mass of the sled? What is the coefficient of friction between the sled and the snow? How fast is the sled moving at the top of a 25.0 m hill? How long does it take Mr. Doyle to transport his passenger to the top of the hill?