(a) `F = ma = (72 kg + 15kg)(0.60 m//s^2) = 52N`
W = F s =(52N)(2.5m) =130J
(b) As W = F s, `s = (W)/(F) = (140J)/(52N) = 2.7m `
(c ) No, the work done on an object W = F s, does not depends on whether the object moves through
the distance s quickly or slowly.