Question

The object with a mass of 1 kg moves to the right with a speed of 20 m / s. Pounding another ball with the same mass that stays on the floor. The speed of each ball after the collision is not altogether is

Answer 1

MOMENTUM


m2 = m2 = 1 kg
v1 = 20 m/s
v2 = 0
v' = __?


m1 v1 + m2 v2 = (m1 + m2) v'
1 • 20 + 0 = (1+1) • v'
20 = 2 v'
v' = 10 m/s

Answer 2

Collision isn't ALTOGETHER .
e.g collision is an elastic collision .

use Law of conservation of mommentun
m1V1 + m2V2 = ( m1 + m2)V

here ,
m1 = m2 = 1 kg
V1 = 20 m/s
V2 = 0

now,

1 × 20 + 1 × 0 = ( 1 + 1)V

V = 20/2 = 10 m/s