I don't know if my answers are right. D:

Question

1)Why is a time interval always positive?

I'm not really sure but I wrote down something with vectors and scalars.

2)If the average acceleration of a car is zero in a given time interval, what can you tell about the displacement of the car for that interval?

The displacement is also zero when the average acceleration is zero because the car will not be moving without any acceleration to move forward or backwards in that time interval.

Answer 1

time interval positive? Time interval is an absolute magitude,by convention.

displacement= velocity*timeinterval
You are wrong. When acceleration is zero, the car is at constant velocity.

Answer 2

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