From position to velocity. In tutorial, you always walked in front of the motion

Question

From position to velocity. In tutorial, you always walked in front of the motion detector. If you could go behind it, your position would be negative. For instance, a position x = -2 meters behind the detector instead of 2 meters in front of it. For each of your answers, explain your reasoning. Answer in terms of individual lettered points, not intervals between lettered points. At which of the lettered points on the graph below: is the motion slowest? is the person speeding up? is the person slowing down? is the person reversing direction? A common mistake is to say the person reverse direction at point E. Why do you think a student might make that mistake? What might you say to the student to help him avoid that mistake in the future?

Explanation / Answer

A 1.) F,B (slope is minimum) 2.) C and E 3.) A,D and F 4.) B B the dirction of velocity is not changing at E it has already changed at B and at E it has passed through its initial position.

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