Question

10. A gun mass of 5kg fires a bullet of mass 50g with velocity of 150m/s, then the recoil velocity of gun is; (a) 1.55m/s (b) 2m/s (c) 0.5m/s (d) 10m/s​

Answer 1

Answer:

(b) 2m/s

Explanation:

Let mass and velocity of ball be m1=0.05kg and velocity v1=200m/s.

Let mass of gun be m2=5kg and recoil velocity be v2

Use conservation of momentum.

m1v1=m2v2

(0.05)×(200)=(5)v2

V2=2m/s.

Answer 2

Let mass and velocity of ball be m1=0.05kg and

velocity v1=150m/s.

Let mass of gun be m2=5kg and recoil velocity be v2

Use conservation of momentum.

m1v1=m2v2

(0.05)×(150)=(5) × v2

0.05× 150 / 5 = 1.55 m/s