Question

What do you understand by the term acceleration when is acceleration positive and when is it negative state the unit of acceleration in si system?

Answer 1

Acceleration of an object is,rate of change of its velocity.
Mathematically,
a=(v-u)/t
here v is final velocity and u is initial velocity.
Negative acceleration when u > v
positive when v > u
SI unit m/s^2

Answer 2

Answer:

Here is the answer of your questions