A 2000 k g rocket in free space expels 0.5 k g of gas per second at exhaust velocity 400 m s - 1 for 5 s . The increase in the speed of the rocket in this time is

Question

A 2000 k g rocket in free space expels 0.5 k g of gas per second at exhaust velocity 400 m s - 1 for 5 s . The increase in the speed of the rocket in this time is, 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 × ∆ v 5 ⇒ ∆ v = 0.5 m s - 1

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