Question
Question: A 50kg man with 20kg load on his head climbs up 20 steps of 0.25m height each. The work done in clim...
A 50kg man with 20kg load on his head climbs up 20 steps of 0.25m height each. The work done in climbing is
A
5 J
B
350 J
C
100 J
D
3430 J
Answer
3430 J
Explanation
Solution
Total mass = (50 + 20) = 70 kg
Total height = 20 × 0.25 = 5m
∴ Work done = mgh = 70 × 9.8 × 5
= 3430 J