Momentum and CollisionHardBloom L3
Question
A rocket of mass 4000 kg is set for vertical firing. How much gas must be ejected per second so that the rocket may have initial upwards acceleration of magnitude 19.6 m/s2.
[Exhaust speed of fuel = 980 m/s.]
Options
A.240 kg s–1
B.60 kg s–1
C.120 kg s–1
D.None
Solution
Sol.
Initial ⇒ mass = 4000
μvrel – mg = ma
μ × 980 – 4000 × 9.8
4000 × 19.6
⇒ μ = 40 + 80 = 120
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