An 85-kg cart is deposited on a 1.5-m platform after being rolled up an incline formed by a plank of length L that has been laid from the lower level to the top of the platform. (Assume that the rolling is equivalent to sliding without friction.)

(a) Find the force parallel to the incline needed to push the cart up without acceleration for L = 3, 4, and 5 m.

(b) Calculate directly from Equation 6-15 the work needed to push the cart up the incline for each value of L.

(c) Since the work found in (b) is the same for each value of L, what advantage, if any, is there in choosing one length over another.

Transcribed Image Text:

W = F ds %3D 6-15