Acceleration - Acceleration is seen in non-uniform motion and it can be defined as the rate of change of velocity with time. 

  • Acceleration (a) = Change in velocity/Time = (v-u)/t                  

    where, v = final velocity, u = initial velocity 

  •  If v > u, then ‘a’ will be positive (+ve). 

Retardation/Deceleration - Deceleration is seen in non-uniform motion during decrease in velocity with time. It has same definition as acceleration

  • Deceleration (a') = Change in velocity/Time = (v-u)/t 
  • Here, v < u, ‘a’ = negative (-ve). 
  • It is a vector quantity.
  • SI unit – m/s2 ( meter per second square)

Example 1: A car speed increases from 40 km/hr to 60 km/hr in 5 sec. Calculate the acceleration of car.

Example 2: A car travelling with a speed of 20 km/hr comes into rest in 0.5 hrs. What will be the valu of its retardation?

EXAMPLE 3 : If the velocity of the car reduced to 80 m/s from 120 m/s in 8 seconds on applying breaks . Calculate its acceleration.

Continue reading to

Join any of the batches using this book

Batch List

Class IX SCIENCE BATCH
Science Made Easy

Course : CBSE Class 9

Start Date : 15.08.2022

End Date : 31.12.2022

Types of Batch : Classroom

Subject M T W T F S S
Science(6 hours) 2:45 PM 2:45 PM 2:45 PM 2:45 PM 2:45 PM 2:45 PM 3:45 PM
SCIENCE CLASS 9TH
Science Made Easy

Course : CBSE Class 9

Start Date : 16.08.2022

End Date : 31.12.2022

Types of Batch : Live Online Class

Subject M T W T F S S
Science(7 hours) 4:15 PM 2:45 PM 4:15 PM 4:15 PM 4:15 PM 4:15 PM 4:15 PM