Question

A body of mass 5kg moving with a velocity 10 m/s collide with another body of the mass 20 kg
at regt and comes to rest the velocity of the second
body due to collisionl is ---
1) 2.5 m/s
2) 5 m/s
3) 7.5 m/s 4) 10 m/s​

Answer 1

♡Answer:♡

1) 2.5m/s

♤Explain:♤

m1 ≈ 2 kg

u1 ≈ 10

v1 ≈ 1

m2 ≈ 5

u2 ≈ 0

v2 ≈ ?

according to the law

m1u1+m2u2 ≈ m1v1+m2v2

2 × 10+5 × 0 ≈ 2 × 1 + 5 × v2

20+0 ≈ 2+5v2

20 ≈  2+5v2

20-2 ≈5v2

18 ≈5v2

18/5 ≈ v2

3.6 ≈ v2