JAMB Physics 2020 Objective — Question 9
Question 9 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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9. A rocket is held fixed so that it ejects material horizontally with a speed of 150m/s. If it ejects a mass of 1.2kg/s, calculate the force needed to hold it fixed.
- A. A. 180NCorrect
- B. B. 120N
- C. C. 150N
- D. D. 40N
Explanation
Force = mass flow rate x velocity of exhaust = 1.2 x 150 = 180N.
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