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A machine gun with a mass of 5kg fires a 50g bullet at a speed...

Physics
JAMB 2020

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms\(^{-1}\). The recoil speed of the machine gun is 

  • A. 0.5 ms\(^{-1}\)
  • B. 1.5 ms\(^{-1}\)
  • C. 1 ms\(^{-1}\)
  • D. 2ms\(^-1\)
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Correct Answer: Option C
Explanation

Gun Momentum = bullet momentum 

M\(_a\)V\(_a\) = M\(_b\)V\(_b\)

5 x V\(_a\) = 0.05 x 100 

V\(_a\) = 1m\(^{-1}\) 

There is an explanation video available below.

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Explanation Video

Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995