Child speed at the lowest point
A 38.0-kg child swings in a swing supported by two chains, each 3.08 m long. The tension in each chain at the lowest point is 424 N. Find the child's speed at the lowest point.
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A spaceship and an asteroid are moving in the same direction away from Earth with speeds of 0.83c and 0.39c, respectively. What is the relative speed between the spaceship and the asteroid?
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