A car is released from rest on a frictionless inclined plane. (Figure: twitpic com/e8nkhj) Calculate the momentum pi at the end of the plane in terms of measured quantities x, y, l, and m. Assume θ is very small so that h/l ~= y/x. (Hint: use conservation of energy and K = 1/2mv^2 = p^2/2m
The answer is pi = m(2gyL_i/x)^.5
L_i is supposed to be L subscript i
Could you explain how exactly to derive this equation based on kinetic energy and conservation of energy?