Question

a man of mass 65 kg holding bucket of mass 15 kg he walks 50 m on road at constant speed 3m/s and then climb hill of height 20m then work done by man taking g=10​

Answer 1

for constant speed on straight road wd =0

so wd by man = mgh = 80*10*20=160000Jor 16KJ

Answer 2

No work is done on the level road as he is moving with constant speed

.(W=∆K=0)

Work done up the hill

W=mgh=(65+15)(10)(20)

=16000J