A roller coaster, shown in Fig. 6-38 (h1 = 40 m, h2 = 10 m, h3 = 28 m), is pulled up to point A where it and its screaming occupants are released…

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A roller coaster, shown in Fig. 6-38 (h1 = 40 m, h2 = 10 m, h3 = 28 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

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