A bullet of mass 15g is fired from a ruffles is 100m/s . If the mass of the riffle 1kg what is the recoil velocity of the riffle?

Let the recoil velocity of the rifle be v.

According to the law of conservation of momentum, the total momentum before the firing is equal to the total momentum after the firing.

Initial momentum = Final momentum

(15g * 100m/s) + (1kg * 0) = (15g * 0) + (1kg * v)

Converting the mass of the bullet from grams to kilograms:

15g = 0.015kg

0.015kg * 100m/s + 0 = 0 + 1kg * v

0.015kg * 100m/s = 1kg * v

1.5kg m/s = 1kg * v

v = 1.5 m/s

Therefore, the recoil velocity of the rifle is 1.5 m/s.