Question

a 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25m height each . the work done in climbing is ?

Answer 1

First step is to add up the 2 masses so 50kg+20kg = 70kg

next step is to calculate the actual height difference so again 20x 0.25m =5m

All that's left is to calculate potential energy difference.

Potential energy = mass x height difference x earth gravity = 70kg*5m*9.807 m/s2 = 3432.45J

Since this is a pretty basic question you might get away by approximating earth gravity as 10m/s2 and the result would be 3500J.

Answer 2

Answer:

First step is to add up the 2 masses so 50kg+20kg = 70kg

next step is to calculate the actual height difference so again 20x 0.25m =5m

All that's left is to calculate potential energy difference.

Potential energy = mass x height difference x earth gravity = 70kg*5m*9.807 m/s2 = 3432.45J

Since this is a pretty basic question you might get away by approximating earth gravity as 10m/s2 and the result would be 3500J

Explanation: