Energy questions?? ok i have two questions which i am completely stumped on and i need some help... At riverside park in Agawam, Massachusetts, a ride called the cyclone is a giant roller coaster that ascends a 34.1 m hill and then drops 21.9 m before ascending the next hill. THe train of cars has a mass of 4727 kg. a)how much work is required to get an empty train of cars from the ground to the top of the hill. b)what power must be generated to bring the train to the top of the hill in 30 s. c)how much potential energy is converted into kinetic energy from the top of the hill to the bottom of the 21.9 m drop? a) (4727 kg)(10m/s^2)(34.1m)=1611907 N.m (ithink thats right) b) 1611907N.m/30s=53730.23 watts (i also think this is right) c) Help please?? other question Using her snowmobile, Midge pulls a 60.0 kh skier up a ski slope inclined at an angle of 12.0 degrees to the horizontal. The snowmobile exerts a force of 200.0 N parallel to the hill. If the coeficient of friction between the skis and hte snow is 0.120, how fast is the skier moving afster he has been pulled for 100.0 m starting from rest? (ignore the effects of the static friction that must be overcome to initially start the skier in motion.) Use the law of conservation of energy. i know the formula for conservation of energy is KEo+PEo=KEf+PEf and i think for this problem i would have to find the net work by using the equation of KEf-KEo= net work... i also know the KE=1/2mv^2 and PE=mgh my problem is how do i use this information to solve this problem????