On a frictionless,horizonta lairtable, puck A w ith mass 0.25 kg is moving toward puck B w ith mass 0.35 kg, which is initially at rest. After the collision, puckA has a velocity of 0.12 m/s to the left (-x-direction),and puck B has a velocity of 0.65 m/s to the right (+x-direction). What was the speed of the puck A before the collision?