How fast should a man weighing 600N needs to run, so that his kinetic energy is

Question

How fast should a man weighing

600 N

needs to run, so that his kinetic energy is

750 J

? Take

g = 10 m s^{- 2}

Options:

A . 3ms−1

B . 4ms−1

C . 5ms−1

D . 6ms−1

Answer: Option C
:
C
Given, the weight of a man,

W = 600 N

g = 10 m s^{- 2}

, kinetic energy,

K E = 750 J

Let the mass of the man be

m

and the velocity be

v

.
We know,

W = m g

So,

600 = m \times 10

On solving we get,

m = 60 k g

As we know,

K E = \frac{1}{2} m v^{2}

So,

750 = \frac{1}{2} \times 60 \times v^{2}

or,

v = 5 m s^{- 1}

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