A roller coaster starts from rest at its highest point and thendescends on its (fri
Chapter 10, Problem 23(choose chapter or problem)
A roller coaster starts from rest at its highest point and thendescends on its (fri ctionless) track. Its speed is 30 m/s when itreaches ground leve l. What was its speed when its height washalf that of its starting point?A. 11 mis B. 15 mis C. 21 mis D. 25 mis
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