Question

A rocket is ejecting $50g$ of gases per sec at a speed of $500m/s.$ The accelerating force on the rocket will be

• A. $125N$
• B. $25N$
• C. $5N$
• D. Zero

Answer 1

Answer: (B)

$25N$

Answer 2

$F = u\mspace{6mu}\left( \frac{dm}{dt} \right) = 500 \times 50 \times 10^{- 3} = 25N$