A skier starts at the top of a hill angled at 30 degrees from the horizontal. The hill is 100 meters long. If the coefficient of friction is .2
a) how fast is he going when he reaches the bottom of the hill (Use Conservation of Energy)
b) If he immediately starts up another hill angled at 15 degrees from the horizontal, how far along this slope does he slide before stopping assuming that the coefficient of friction remains the same? A hollow ring with inside radius 25 cm. , outside radius 35 cm. weighs 1.2 kg.