A blue puck with a mass of 0.0450 kg, sliding with a speed of 0.180 m/s on a frictionless, horizontal air table, makes a perfectly elastic, head-on collision with a red puck with mass m, initially at rest. After the collision, the velocity of the blue puck is 0.020 m/s in the same direction as its initial velocity.
Part A
Find the magnitude of the velocity of the red puck after the collision.
Express your answer in meters per second.
$v_{red} =$
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Part B
m/s
Find the direction of the velocity of the red puck after the collision.
Express your answer in degrees.
$\theta =$
$\circ$ from initial blue puck direction
