A 0.32-kg puck at rest on a horizontal frictionless surface is struck by a 0.22-kg puck moving in the positive x-direction with a speed of 7.7 m/s. After the collision, the 0.22-kg puck has a speed of 1.4 m/s at an angle of ? = 60° counterclockwise from the positive x-axis. (a) Determine the velocity of the 0.32-kg puck after the collision. magnitude       m/s direction       ° (clockwise from the +x-axis) (b) Find the percent of kinetic energy lost in the collision. 100    ΔKE KEi

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