Question

A 4.0 kg mass is moving to the right at 3.0 m/s an 8.0 kg mass is moving to the left at 2.0 m/s.If after the collision the two masses join together what is their velocity after collision

Answer 1

Answer:-0.33m/s

Explanation:One of the objects is moving in the opposite direction.

Answer 2

Here we can use momentum conservation for this type of collision problem

we can say

`m_1v_(1i) + m_2v_(2i) = (m_1 + m_2)v`

`4(3) + 8(-2) = (4 + 8)v`

`12 - 16 = 12v`

`-4 = 12v`

`v = -(1)/(3)` m/s

So both of the balls will move to left with speed 0.33 m/s