# When a Car Driver Travelling at a Speed of 10 M/S Applies Brakes and Brings the Car to Rest in 20 S, Then Retardation Will Be: - Science

MCQ

When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then retardation will be :

• + 2 m/s2

• − 2 m/s2

• − 0.5 m/s2

• + 0.5 m/s2

#### Solution

+ 0.5 m/s2

The term “retardation” means negative acceleration.
Initial velocity = 10 m/s
Final velocity = 0 m/s
Time taken = 20 s
Acceleration = "0-10"/20
⇒ Acceleration = -0.5  "m/s"^2
⇒ Retardation = 0.5 "m/s"^2

Concept: Rate of Change of Velocity
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#### APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 1 Motion
MCQ | Q 51 | Page 22