Question: Part A A roller coaster starts from rest at its highest point and then descends on its ( frictionless ) track. Its speed is 2

Part A
A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is 22ms when it reaches ground level.
What was its speed when its height was half that of its starting point?
18ms
11ms
16ms
7.8ms
Part A A roller coaster starts from rest at its

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