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A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s.Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are [NEET Kar. 2013]
  • a)
    –1.6 ms–1; 8 N
  • b)
    –0.08 ms–1; 16 N
  • c)
    – 0.8 ms–1; 8 N
  • d)
    –1.6 ms–1; 16 N
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A person holding a rifle (mass of person and rifle together is 100 kg)...
Ans.

We have to use the Law of momentum conservation:
P ( initial ) = P ( final )
0 = n � m � u + ( M - n � m ) � v
where: n = 10, m = 10 g = 0.01 kg, u = 800 m/s, M = 100 kg.
0 = 10 � 0.01 kg � 800 m/s + ( 100 kg - 10 � 0.01 kg ) � v
v = - 80 kgm/s / 99.9 kgm/s
v = 0.8 m/s
Then : F = Δ P / Δ t = ( 10 � 0.01 kg � 800 m/s ) : 5 s = 16 N
Answer: The average force exerted on the person is 16 N.
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A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s.Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are [NEET Kar. 2013]a)–1.6 ms–1; 8 Nb)–0.08 ms–1; 16 Nc)– 0.8 ms–1; 8 Nd)–1.6 ms–1; 16 NCorrect answer is option 'C'. Can you explain this answer?
Question Description
A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s.Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are [NEET Kar. 2013]a)–1.6 ms–1; 8 Nb)–0.08 ms–1; 16 Nc)– 0.8 ms–1; 8 Nd)–1.6 ms–1; 16 NCorrect answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s.Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are [NEET Kar. 2013]a)–1.6 ms–1; 8 Nb)–0.08 ms–1; 16 Nc)– 0.8 ms–1; 8 Nd)–1.6 ms–1; 16 NCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s.Each bullet has a mass of 10 g with a muzzle velocity of 800 ms–1. The final velocity acquired by the person and the average force exerted on the person are [NEET Kar. 2013]a)–1.6 ms–1; 8 Nb)–0.08 ms–1; 16 Nc)– 0.8 ms–1; 8 Nd)–1.6 ms–1; 16 NCorrect answer is option 'C'. Can you explain this answer?.
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