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The momentum of a body is increased by 20%.The percentage increases in kinetic energy is
Options
(a) 54 %
(b) 44 %
(c) 100 %
(d) 50 %
Correct Answer:
44 %
Explanation:
Increase in KE = p²/2m
New momentum = p + p/5 = 6p/5
KE(f) = [(6/5).p]²/2m = (36/25).(p²/2m)
ΔKE = (36/25).(p²/2m) – (p²/2m) = (11p²/252m)
Percentage increase = 44%
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two bodies A and B have masses 20 Kg and 5 Kg respectively. Each one is acted
- When a current of (2.5±0.5) A flows through a wire, it develops a potential difference
- Dependence of intensity of gravitational field (E) of earth with distance(r)
- Small drops of the same size are charges to V volt each. If n such drops coalesce
- A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth
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Difficulty Level: Easy (1008)
Topics: Work Energy and Power (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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