Question

For motion a straight line, When do we consider the acceleration to be (i) positive (ii) negative?
Give an example of a body in uniform acceleration.

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Answer 1

Explanation:

we consider acceleration to be positive when speed increases with respect to time

negitive acceleration is when speed decreases with respect to time .

uniform acceleration is the change in velocity in equal intervals of time

example - a free falling body .

Answer 2

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Acceleration is defined as the rate of change in velocity. 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.