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A dartboard with a mass of 2.20 kg is suspended from the ceiling such that it is initially at rest.
A 0.030-kg dart is thrown at the dartboard with a velocity of 1.3 m/s.
After the dart hits the dartboard, the dart and the board initially move with a velocity of 0.025 m/s.
How much kinetic energy is lost in the system?
Two 20-g ?atworms climb over a very thin wall, 10 cm high. One of the worms is 20 cm long, the other is wider and only 10 cm long. Which of them has done more work against grav
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