Question

bullet of mass 100 gram is fired from a rifle of mass 20 kg with a speed of 50 m/s. Calculate the velocity of recoil of rifle. *
2.5 m/s
25 m/s
0.25 m/s
0.025 m/s​

Answer 1

Answer:

Mass of bullet (mb) = 100 g = 100/1000 kg = 0.1 kg

Mass of rifle/gun (mg) = 20 kg

Velocity of bullet (vb) = 50 m/s

Formula of recoil velocity ⇒

vg = -(mb vb/mg)

vg = -(0.1 * 50/20)

vg = -(0.1 * 5/2)

vg = -(0.5/2)

vg = -0.25 m/s

Hence, the recoil velocity of the gun is -0.25 m/s.

In the options. you must mention the negative sign or else in the velocity of bullet you must mention the negative sign as one of them are always negative.

Hope it helps.

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