I've been working on this for the past 3 days, and I have come up with no logical solution. Please help, even if it's just telling me how to set up my equations correctly, because I just can't seem to. A sled with rider (no mass given) starts with an initial velocity of 4 m/s at the top of a hill that is inclined at 12 degrees with the horizontal. The hillside is 195m long, and the coefficient of friction between snow and sled is .06. At the bottom of the hill, the snow is level and the coefficient of friction is unchanged. There exists a 35 degree (from horizontal) ramp that is 5m long 30m from the bottom of the hill. How high does the rider get off of the ground? If i had a mass, this wouldn't be so hard. Apart from struggling to find a force or final velocity, what can I possibly do? I have the whole KE=1/2mv^2 part started, and the PE=KE, but i have no idea where to go from there. i know that it is POSSIBLE to solve this without knowing mass, I just don't know how to really set it up correctly.