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