(a) What is the minimum work needed to push a 1150 kg car 240 m up a 17.5° incline with zero friction?

Question

(b) What is the minimum work needed if the effective coefficient of friction is 0.20?

Answer 1

(a) Mass * g * (elevation gain)
(b) Answer (a) + friction work.

(friction work = 240 m * M g cos17.5)

Answer 2

B) answer (a) + (240m*.20*1150kg*9.8*cos17.5)

he forgot the effective coefficient of .20 ...