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Question

How much energy is gained by a box of mass 20kg when a man.

(i) Carrying the box waits for 5min for a bus?


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Solution

Step 1: Given data:

Mass m=20kg

The waiting time by the man for the bus is 5min.

Step 2: Find the energy gained by a box:

We know, Workdone=Force×Displacement

  1. The displacement travelled by the man is zero, as the man is standing for the bus in a place for 5min.
  2. When the displacement travelled by the body is zero, the work done is also zero.

Hence, the energy gained by a box of mass 20kg when a man carrying the box waits for 5min for a bus is zero.


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