Question

A man of Mass 80kg carried a block of mass 20 kg through a height of 10 m calculate the work done by this man in joules (g=10m|s2)

Answer 1

Explanation:

work done=change in energy

here potential energy changes

p.e=mgh

so work done=20*10*10=2000J

Answer 2

• Mass of the man = 80 kg

• Mass of the block = 20 kg

• Acceleration due to gravity = 10 m/s²

Here, mass loaded by the man, F = (80 + 20) = 100 kg

Force = ma = 100 × 10 = 1000 N

Work done by the man, i.e., W = F × s = 1000 × 10

= 10000 J