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Ball launched using a compressed spring - maximum height

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A vertical spring (ignore its mass), whose spring constant is 900 N/m, is attached to a table and is compressed 0.150m. What speed can it give to a .300-kg ball when released? How high above its original position (spring compression) will the ball fly?

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The energy stored in the spring is given by E = (1/2) K x^2

where K is the spring constant and x is the compression
Here the energy stored = (1/2) * 900 * 0.15 * 0.15

E = 10.1 ...

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