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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
- Which scientist experimentally proved the existence of electromagnetic waves?
- A and B are two metals with threshold frequencies 1.8 x 10¹⁴ Hz and 2.2 x 10¹⁴ Hz.
- A block is moving up an inclined plane of inclination 60° with velocity of 20 ms⁻¹
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- If an A.C. mains supply is given to be 220 V, what would be the average e.m.f.
Question Type: Memory (964)
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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