3. In the given roller coaster, the car is at rest at P and possess maximum PE of 5000). (a) What will be its KE at Q? (b) When the PE at Ris 2400), what will be its KE at R? (c) At S, when KE is 3200 J, what would be the PE at S? (d) What is the total ME at P, Q, R and S?
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