Work Energy And Power Question 241

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

Options:

A) 2m/s

B) (21)m/s

C) 1(21)m/s

D)

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Let m=massofboy , M=massofman

v=velocityofboy , V=velocityofman

12MV2=12[12mv2] -(i)

12M(V+1)2=1[12mv2] -(ii) Puttingm=M2andsolvingV=121



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