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Question

A skydiver who weighs 60 kg is falling down at a certain speed. He covers 40 m in 2 seconds. The rate of doing work by the skydiver is [Take g=10 m/s2]



Correct Answer
A

12 kW

Your Answer
B

16 kW

Your Answer
C

24 kW

Your Answer
D

32 kW


Solution

The correct option is C

12 kW


Rate of doing work is the power of the skydiver = work donetime

Work done = Force x Displacement 

Force = m×g=(60×10)N

Dispalcement= 40 m (Given)

Now, work done=(60×10×40) J
So, rate of doing work by the skydiver =60×10×402 W
                                                             =12000 W
                                                             =12 kW
Therefore, power of the skydiver is equal to 12 kW.

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