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1. A rock moves only in the vertical direction. Its acceleration is constant and is downward with a magnitude of -0.00160 km/s . Its

1. A rock moves only in the vertical direction. Its acceleration is constant and is downward with a magnitude of -0.00160 km/s . Its initial velocity is upward and its initial speed is 0.480 km/s. Its initial height is 1.400X10-3 km. A) What is its average velocity on the way up? B) Will it return to its initial height and if so at what time?

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