Laws Of Motion Question 255

Question: N bullets each of mass m kg are fired with a velocity $ vm{{s}^{-1}} $ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

Options:

A) nmv

B) $ \frac{Nmv}{n} $

C) $ n\frac{Nm}{v} $

D) $ n\frac{Nv}{m} $

Show Answer

Answer:

Correct Answer: A

Solution:

Total mass of bullets = Nm, time $ t=\frac{N}{n} $

Momentum of the bullets striking the wall = Nmv Rate of change of momentum (Force) = $ \frac{Nmv}{t} $ = nmv.



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