Question

Define acceleration and state its SI unit. For motion along a straight line, when do we consider the acceleration to be a) positive (b) negative? Give an example of a body in uniform acceleration.

Answer 1

hey the answer is .....

ACCELERATION - MEASURE IN CHANGE OF THE VELOCITY OF THE MOVING OBJECT PER UNIT TIME.

SI UNIT - m s ^-2

1. IF THE OBJECT MOVES ALONG THE STRAIGHT LINE THEN IT IS SAID TO BE POSITIVE.

2. IF THE OBJECT MOVES OPPOSITE DIRECTION OF THE STRAIGHT LINE THEN IT IS SAID TO BE NEGATIVE.

EG. OF UNIFORM ACCELERATION IS ....

A FREELY MOVING BODY.


hope it helps uu dear

Answer 2

acceleration is defined as the gain in speed of the body when it is moving. it is vector quantity. its S.I unit is m/s^2 .when the body is moving with a gain in speed in a straight line is said to be positive and when body is coming to the rest or it is slow down when the body is moving , the acceleration is said to be negative. a ball falling from the height accelerates to come down