A force is applied to a toy car so that the car is moving toward the right (posi

Question

A force is applied to a toy car so that the car is moving toward the right (positive) but is slowing down at a steady rate (constant acceleration).

Choose the force graph which could allow the described motion of the car to continue.Assume friction is so small that it can be ignored.

The graphs can be found here: http://i.imgur.com/it9oL1Y.png

Please give an explanation.

The roller-coaster car shown in Fig. is dragged up to point 1 where it is released from rest. Assuming no friction, calculate the speed at points 2, 3, and 4.

Explanation / Answer

graph 3 since acceleration is constant, hence the force is constant

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