Question

1. Define acceleration and state its Sl unit. 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

Answer:

Acceleration is the rate of change of velocity . SI UNIT- m/s²

i) when an object is accelerating in the same direction as the velocity.

ex- a car moving in a road.

ii) when the acceleration is in the opposite direction of the motion .

ex- when an object is thrown up.

EXAMPLE; the motion of a freely falling body upward.