Question: A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is 24 m/sm/s when it reaches

A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is 24 m/sm/s when it reaches ground level. What was its speed when its height was half that of its starting point?

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