Which of these are true?

Question

1.The units for acceleration are m2/s2.
2.Acceleration is a change in speed over time.
3.The slope of a speed-time graph gives the velocity.
4.A positive slope on a distance-time graph means that the object is accelerating.

Answer 1

1. False- units are m/s^2
2. False- Acceleration is the change in velocity over time, not the change in speed over time. Speed is a scalar quantity where velocity is a vector quantity.
3. False- slope of a speed time graph does not give velocity, velocity is the change in displacement over unit time
4. False- Positive slope on a time vs. distance graph only means positive velocity, there is not enough information to tell whether the object is accelerating or not from the question.

Answer 2

1) false m/s2

2) true acceleration = speed divided by time

3) false

4) true acceleration is derivative of speed when derivative is positive it accelerates

Answer 3

All true