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A rocket initially ejects gas from its rear at a mass rate of 0.1 kg s⁻¹. If the exhaust speed relative to the rocket is 50 m s⁻¹ and the rocket’s mass is 2 kg, what is its acceleration in m s⁻²?
- 5.2
- 2.5
- 25
- 10
Correct answer: 2.5
Solution
Thrust force = (exhaust speed)*(mass rate) = 50*0.1 = 5 N. Acceleration = thrust/mass = 5/2 = 2.5 m/s^2.
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