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During an ice skating performance, an initially motionless 78 -kg clown throws a fake barbell away horizontally. The clown's ice skates allow her to recoil

During an ice skating performance, an initially motionless 78-kg clown throws a fake barbell away horizontally. The clown's ice skates allow her to recoil frictionlessly.

a) If the clown recoils with a speed of 0.515 m/s and the barbell is thrown with a speed of 10.5 m/s, what is the mass, in kilograms, of the barbell?

b) How much kinetic energy, in joules, is gained by this maneuver?

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