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Question

How fast should a man weighing 600N needs to run, so that his kinetic energy is 750J? Take g=10ms−2


A

3ms1

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B

4ms1

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C

5ms1

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D

6ms1

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Solution

The correct option is C

5ms1


Given, the weight of a man, W=600N, g=10ms2, kinetic energy, KE=750J
Let the mass of the man be m and the velocity be v.
We know, W=mg
So, 600=m×10
On solving we get, m=60 kg
As we know, KE=12mv2
So, 750=12×60×v2
or, v=5ms1


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