Work Energy And Power Question 99

Question: A body of mass 2 kg collides with a wall with speed 100 m/s and rebounds with same speed. If the time of contact was 1/50 second, the force exerted on the wall is [CPMT 1993]

Options:

A) 8 N

B) $ 2\times 10^{4}N $

C) 4 N

D) $ 10^{4}N $

Show Answer

Answer:

Correct Answer: B

Solution:

$ F=\frac{dp}{dt}=m\frac{dv}{dt}=\frac{m\times 2v}{1/50} $ = $ \frac{2\times 2\times 100}{1/50}=2\times 10^{4}N $



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