Q770
A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is
A.
Zero
AnswerB.
One
C.
Less than one
D.
More than one
Answer: Option A
Solution
Answer: Option A
Solution:
Since, the the mass of the bullet is smaller than the mass of the rifle hence, the velocity of the bullet is more than the rifle recoil velocity. Also, kinetic energy is inversely proportional to the mass. Hence, when a bullet is fired from a rifle and the rifle recoils freely then the kinetic energy of the rifle will be less than that of bullet.