Question
(a) During an ice skating performance, an initially motionless 80.0-kg clown throws a fake barbell away. The clown’s ice skates allow her to recoil frictionlessly. If the clown recoils with a velocity of 0.500 m/s and the barbell is thrown with a velocity of 10.0 m/s, what is the mass of the barbell? (b) How much kinetic energy is gained by this maneuver? (c) Where does the kinetic energy come from?
1. $4.00 \textrm{ kg}$
2. $210\textrm{ J}$
3. The energy comes from food energy converted into kinetic energy by the clown's muscles.
Solution Video