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

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

we can say

$m_1v_{1i} + m_2v_{2i} = (m_1 + m_2)v$

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

$12 - 16 = 12v$

$-4 = 12v$

$v = -\frac{1}{3}$ m/s

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

Answer 2

Answer:-0.33m/s

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