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A roller coaster, shown in Fig. 6-38 (h1 = 50 m, h2 = 15 m, h3 = 24 m), is pulled up to point A where it and its screaming occupants are released...

A roller coaster, shown in Fig. 6-38 (h1 = 50 m, h2 = 15 m, h3 = 24 m), is pulled up to point A where it and its screaming occupants are released from rest. Assuming no friction, calculate the speed at points B, C and D.
point B

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