Question

elf Test (7):
A 150gm bullet is fired from 15kg gun with speed of 1500m/s. What is the speed
of recoil of the gun.
.
(2003 P.M)
ns. V1=-15 m/s​

Answer 1

Explanation:

using law of conservation of momentum

m1v1 = m2v2

150 x 1500 = 15000 x v2

v2 = 15m/s

the recoil has a magnitude of 15m/s

since recoil and motion of bullet are opposite...

it is given a negative sign

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Answer 2

The velocity of gun has negative sign because it moves in the direction opposite to that of the bullet.

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