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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.MiscellaneousMedium2 minPYQ_2018

PhysicsMediumsingle choice

A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by $1 m / s$ so as to have same K.E. as that of the boy. The original speed of the man will be

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Answer:

Solution:

Let $m =$ mass of boy, $M =$ mass of man $v =$ velocity of boy, $V =$ velocity of man $\frac{1}{2} M V^{2} = \frac{1}{2} [\frac{1}{2} m v^{2}] .... (i) \frac{1}{2} M (V + 1)^{2} = 1 [\frac{1}{2} m v^{2}] .... (ii)$ Putting $m = \frac{M}{2}$ and solving $V = \frac{1}{2 - 1}$

Stream:VITEEESubject:PhysicsTopic:W.E.P.Subtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2018

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