When a 4 ,kg rifle is fired, 10 ,g bullet receives an acceleration of 3 × 10^6 ,cm / s ^2 . magnitu

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4-1.Newton's Laws of Motion

easy

When a $4 \,kg$ rifle is fired, the $10 \,g$ bullet receives an acceleration of $3 \times 10^6 \,cm / s ^2$. The magnitude of the force acting on the rifle (in newton) is ............

A

Zero

B

$120$

C

$300$

D

$3000$

Solution

(c)

Using Newton's third law, bullet will apply the same force in the opposite direction.

So, using $F=m a=\frac{10}{1000} \times 3 \times 10^6 \times 10^{-2}=300 \,N$

Standard 11

Physics

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