Q. In a rocket of mass $1000\ kg$ fuel is consumed at a rate of $40\ kg/s$. The velocity of the gases ejected from the rocket is $5 \times 10^{4}\ m/s$. The thrust on the rocket is
A) $2 \times 10^{3}\ N$
B) $5 \times 10^{4}N$
C) $2 \times 10^{6}\ N$
D) $2 \times 10^{9}\ N$
Explanation
(c) Thrust $F = u\left( \frac{dm}{dt} \right) = 5 \times 10^{4} \times 40 = 2 \times 10^{6}N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.