A 900 kg roller coaster car starts from rest at point A, rolls down the track, goes around a loop (points B and C) and then flies off the inclined part of the track (point D), Figure 2. The dimensions are: H= 80 m, r = 15 m, h = 10 m and e = 30°. Calculate the (a) gravitational potential energy at point A. (b) velocity at point C, if the work done to move the roller coaster from point B to C is 264870 J. (c) distance of the car land (in the horizontal direction) from point D if given the velocity at point D is 37.06 ms!.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”