Assertion: Power of machine gun is determined by body both the number of bullet fired per secondand kinetic energy of bullets.
Reason: Power of any machine is defined as work done(by it) per unit time.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

K.E. of one bullet `= k therefore K.E.` of n bullet = n k
According to law of conservation of energy, the kinetic energy of bullets be equal to the work done by machine gun per sec.