Question

suppose two putty balls move along a frictionless floor. if one of the balls(A) is moving to the lest at 15m/s and the other ball(B) is moving to the right at 25m/s. they stick together after collision. determine their common velocity if their masses are equal

Answer 1

calling right positive
25 m - 15 m = 40 m v
v = 10/40
= 0.25 m/s