ball spring speed and force constant

A ball of mass m = 1.80 kg is released from rest at a height h = 65.0 cm above a light vertical spring of force constant k. The ball strikes the top of the string andcompresses it a distance d = 9.00 cm. Neglecting any energy losses during the collision, find (a) the speed of the ball just as it touches the spring and (b) the forceconstant of the spring.


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