A 2000 kg rocket in free space expels 0.5 kg of gas per second at an exhaust velocity of 400 m s - 1 for 5 seconds. The increase in the speed of the rocket in this time is (Assume time interval is too small to consider variation in acceleration)

Question

A 2000 kg rocket in free space expels 0.5 kg of gas per second at an exhaust velocity of 400 m s - 1 for 5 seconds. The increase in the speed of the rocket in this time is (Assume time interval is too small to consider variation in acceleration), 2000 m s - 1, 200 m s - 1, 0.5 m s - 1, zero

MARKS App · Accepted Answer

d m d t × u = M d v d t 0.5 ×400=2000× Δ v 5 ⇒ Δ v = 0.5 m s - 1

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