Question

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

Answer 1

hey the answer is .....

1. if the object moving along the straight line then it is said to be positive acceleration

2. if the object moving opposite direction of the straight line then it is said to be negative acceleration.

example -- a freely falling body/object...


hope it helps uu dear ☺☺

Answer 2

Acceleration is defined as the rate of change in velocity.

Its S.I. unit is m/s^2

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.

The motion of a freely falling body and a vertically thrown up body are the  example of uniform accelaration.