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Q. Two objects attract each other gravitationally with a force of 2.8×10-10 when they are 0.65 apart. Their total mass is 4.6 .Find their individual masses.

Q. A model rocket is launched vertically at v0 =55 m/s. It accelerates at 2.2 m/s2 until the engine stops at 150 m above ground. (a) What is the maximum height the rocket reaches? (b) How long is the rocket in the air?

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