Question: 12. A roller-coaster car may be represented by a block of mass m = 400.0 kg. The car is released from rest at a height

12. A roller-coaster car may be represented by a block of mass m = 400.0 kg. The car is released from rest at a height h = 70.0m above the ground and slides along a frictionless track. The car encounters a loop of radius R = 16.0m at ground level, as shown. Ignore air drag. (a1/5) Find the kinetic energy of the car at the top of the loop. (b1/5) Find the speed of the car at the bottom of the loop. (C3/5) Find the minimum initial height h at which the car can be released that still allows the car to stay in contact with the track at the top of the loop

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