Assertion : Power of machine gun is determined by both, the number of bullet fired per second and kinetic energy of bullets.Reason : Power of any machine is defined as work done (by it) per unit time.
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a
If both assertion and reason are true and reason is a true explanation of assertion.
b
If both assertion and reason are true but reason is not the correct explanation of assertion
c
If assertion is true but reason is false.
d
If both assertion and reason are false.
answer is A.
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Detailed Solution
KE of one bullet = k and KE of n bullet = nkAccording to law of conservation of energy, the kinetic energy of bullets be equal to the work done by machine gun per sec.