Question

For motion along a straight line when do we consider acceleration to be positive and negative .​

Answer 1

Answer:

For motion along a straight line, if the velocity of the body is increasing with time, then it is said to be in positive acceleration. While, if the velocity of the body is decreasing with time, then it is said to be in negative acceleration or retardation.

Explanation:

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Answer 2

Answer:

In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. In SI units, acceleration is measured in meters/second² using an accelerometer. ...