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Physics - momentum

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Two hockey pucks approach each other as shown in the figure below. Puck 1 has an initial speed of 22 m/s, and puck 2 has an initial speed of 14 m/s. They collide and stick together.

Find the components along x and y of the initial velocities of both particles.
v1xi = 19.1 m/s
v1yi = -11 m/s
v2ix = 0 m/s
v2iy = 14 m/s

I don't understand how to..

Find the final velocity of the two pucks after the collision and angle

What fraction of the initial kinetic energy is lost in the collision

  • Physics - momentum -

    Found the final velocity and angle..

    just don't understand the initial KE part now

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