A 100 kg rollercoaster car is moving with a speed of 10m/s at position A which is 20m above the ground. Assuming there is no friction or air
resistance on the track, how much total energy should the car have when
it reaches position B, a hill of 10m?

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

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