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Two isolated masses, M1 = 2.5 kg and M2 = 619.0 kg are initially at rest,...

Two isolated masses, M1 = 2.5 kg and M2 = 619.0 kg are initially at rest, a distance d= 146.0 cm apart. Their gravitational attraction is the only force acting. Calculate the time it takes for M1 to move from that distance to 144.0 cm from M2. Assume that M2 does not move and that the force is constant over that small distance, and equal to that at 145.0 cm. Find the speed of M1 when d = 144.0 cm. I need help!

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