Two spheres A and B approach each other along the same straight line with speeds $u_A$ and $u_B$. The spheres collide and move off with speeds $v_A$ and $v_B$, both in the same direction as the initial direction of sphere A, as shown below.
Which equation applies to an elastic collision?

$u_A+u_B=v_A-v_B$
2 )
$u_A-u_B=v_A-v_B$
3 )
$u_A-u_B=v_A+v_B$
4 )
$u_A+u_B=v_A+v_B$
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