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Q. What is the magnitude of the acceleration of two falling sky divers (mass = 140 including parachute) when the upward force of air resistance is equal to one-fourth of their weight?

Q. A 16 kg steel ball is launched from a cannon at an angle of 20 degrees above the horizontal. The cannon exerted an average force of 1200 Newtons on the ball during launch. Now that the ball is in the air and has almost reached its target, what is the magnitude of the net force acting on the ball? (Neglect air resistance.)

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