Question

A 25g bullet leaves a rifle with a velocity of 100 ms-1

. If the rifle recoils with a velocity of

100 cm/s, what is the mass of the rifle?
ill mark brainliest to the first answer ​

Answer 1

Answer:

please mark it as brainlest answer please

Explanation:

according to law of conservation of momentum

MU + mu = MV + mv

Let M = 2.5 kg

m = m kg

initial velocity = 0 ( cause both were at rest before firing)

V = -1 m/s (it acts in opp. direction)

v = 100 m/s

2.5 X 0 + m x 0 = 2.5 x -1 + m X 100

0 = -2.5 + 100m

2.5 = 100m

25/1000 or 0.025 = m <= answer