Question

A rocket having initial mass of 1000 kg burns fuel at the rate of 4 kg/s. If the speed of exhaust gases relative to the rocket is 3000 m/s, the initial thrust on the rocket is

(a)  1.2 N

(b)  3 × 10³ N

(c)  4 × 10³ N

(d) 1.2 × 10⁴ N 

Answer 1

Correct option  (d) 1.2 × 10⁴ N

Explanation:

Thrust = F = vdm/dt