Question

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. $2\times {10}^{9}N$

Answer 1

The correct option is C

$2\times {10}^{6}N$

Thrust on the rocket $F=\frac{udm}{dt}=5\times {10}^4\left(40\right)=2\times {10}^{6}N$