IWs Hockey pucks with different masses are on a has a mass M,-0.2 kg and is movi

Question

IWs Hockey pucks with different masses are on a has a mass M,-0.2 kg and is moving with unknown veloci collision, the red puck is moving at 8 m/s to the left, and the blue puck is moving at 5 m/s to the left. hockey rink. The red puck has a mass M, 0.1 kg is motionless, the blue puck ty to the left. It collides with the motionless red puck. After the 0 m/s ?7 5 m/s a) What is the initial velocity of the blue puck before the collision? b) Find the loss (change) in total kinetic energy of the system after collision?

Explanation / Answer

(A) Applying momentum conservation,

pi = pf

(0.1 x 0) + (0.2 x v) = (0.1 x 8) + (0.2 x 5)

v = 9 m/s to the left .....Ans

(B) Ki = (0.1 x 0^2 / 2) + (0.2 x 9^2 / 2 ) = 8.1 J  

Kf = (0.1 x 8^2 / 2) + (0.2 x 5^2 / 2) = 5.7 J

K Energy loss = Ki- Kf = 2.4 J

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