In a rocket, fuel burns at the rate of 1 kg/s. This fuel is ejected from the rocket with a velocity of 60 km/s. This exerts a force on the rocket equal to (a) 6000 N (b) 60000 N (c) 60 N (d) 600 N

Answer: (b). Thrust F = udm/dt. F = (60 × 10³) × 1 = 60000 N So the answer is (b) 60000 N.

In a rocket, fuel burns at the rate of 1 kg/s. This fuel is ejected… | NEET 1994 (AIPMT)

Q26NEET 1994 · AIPMTEasy

Impulse & Momentum Conservation

In a rocket, fuel burns at the rate of $1\text{ kg/s}$ . This fuel is ejected from the rocket with a velocity of $60\text{ km/s}$ . This exerts a force on the rocket equal to

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Answer: (b)

Thrust $F = u\frac{dm}{dt}$ .
$F = (60 \times 10^{3}) \times 1 = 60000\text{ N}$
So the answer is (b) $60000$ N.

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