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# How Fast Should a Man of 50 Kg Run So that His Kinetic Energy Be 625 J? - Science

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How fast should a man of 50 kg run so that his kinetic energy be 625 J?

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#### Solution

We have to find the speed of the running man. We have,
Mass of the man (m) = 50 kg
Kinetic energy of the man (K.E) = 325 J
So, we use the expression of kinetic energy to find the unknown quantity as,
K.E = 1/2 mv^2
Where,
KE - Kinetic Energy
m - Mass
v - Speed
So,
v = sqrt((2(K.E))/((m))
Therefore ,
v = sqrt((2(625))/((50)) m/s
= sqrt(25) m/s
= 5 m/s
So , the man should be running with a speed of 5 m/s .

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#### APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 4 Work and energy
Very Short Answers | Q 14 | Page 145
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