Question

A load of 220kg is vertically pulled up by a crane through a vertical height of 16m in 40s. Calculate 

(1) Force acting in the upward direction 

(2) Total work done 

(3) Horse power of the engine pulling the rope 

[Take g = 9.8ms^-2; 1HP = 750w]

Answer 1

Mass m = 220kg g = 9.8ms^-2 h = 16m t = 40s 

(1) Force F = mg = 220 x 9.8 = 2156N 

(2) Total work done = W = F x S 

W = 2156 x 16 = 3496J