Question

define acceleration find its expression and write ​

Answer 1

Answer:

Acceleration is defined as the rate of change of velocity of a body per unit time.

•It is measured in m/s^2.

•It is denoted by the a

There are two types of acceleration:

1.Positive Acceleration:

An object moving in same direction as it's velocity is said to be having position acceleration

2. Negative Acceleration or Retardation:

When the object is moving in opposite direction with respect to it's velocity,it is said to be experiencing negative acceleration.

E.g., When brakes of a vehicle are applied

Formula of calculating acceleration:

$a = \frac{v - u}{t}$

Here,

u is initial velocity

v is final velocity

t is time taken

Answer 2

Answer:

The rate of change of velocity age called acceleration

a=v-I/t

S.I unit of acceleration is ms-2