### What is the acceleration of two falling sky divers

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Q. A 13.00 g bullet travelling 236 m/s penetrates a 2 kg block of wood and emerges cleanly at 179 m/s. If the block is stationary on a frictionless surface as hit, how fast does it move after the bullet emerges?

Q. What is the acceleration of two falling sky divers (mass 113 kg including parachute) when the upward force of air resistance is equivalent to one-fourth of their weight?

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