A worker climbs up a staircase carrying a load of 40 kg on his head. The staircase has 20 steps and the height of each step is 10 cm. What is the work done by the worker to lift the load against the gravity when he reached the 20th step?
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Answer:
Total work done is 800 J
Explanation:
Work done = Force x displacement
Height of 1 step = 10 cm
Height of 20 steps = 20 x 10 = 200 cm or 2 m.
Here, Gravity acts as a force.
So, here consider the Gravitational force.
Gravitational force = mg. (g = 9.8 or 10)
Gravitational force = 40 x 10
Gravitational force = 400 N
Work Done = Force x displacement
Work done = 400 x 2 m = 800 J
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