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Selina Solutions Class 9 Physics Solutions for Exercise 2C in Chapter 2 - Chapter 2 Motion In One Dimension

Question 14 Exercise 2C

A car travels a distance 100m with a constant acceleration and average velocity of 20m/s. The final velocity acquired by the car is 25m/s. Find: (i) the initial velocity and (ii) acceleration of car.

Answer:

Given: v=25m/s; s=100m; average velocity=20m/s

(i) We know that average velocity = (u+v)/2

20 = (u+25)/2

u = 40-25 = 15m/s

(ii) v^2-u^2=2as

(25 x 25) – (15 x 15)

= 2 x a x 100

625-225=200a

a = 2m/s

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