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As shown in the left figure, a ball of mass m= kg is held at a distance h= meters above the ground. A spring with spring constant k= N/m, in a relaxed state, holds a platform a distance h0= meter above the ground.

The ball is released, and falls until it sticks onto the platform. When the ball is eventually stopped by the spring, the spring is compressed down as shown in the right figure. By how much is the spring compressed?

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