Question

A sphere of mass 2kg moving with a velocity of Sm's collides elastically with another sphere of mass 4kg moving with a velocity of 2ms in the opposite direction. Find the velocity of spheres after collision if they move together.
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Answer 1

Explanation:

s²+8=v1 ² +2( v2) ²

v1 = (-2 s )/ 6

v2 =(-2 .2)/6

s² +8 s²/9 + 8/9

8s²=64

s=8½