Question

A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m/sec. The accelerating force on the rocket is

• A. 20 dynes
• B. 20 N
• C. 22 dynes
• D. 1000 N

Answer 1

Answer: (B)

20 N

Answer 2

$F = u\left( \frac{dm}{dt} \right) = 400 \times 0.05 = 20\mspace{6mu} N$