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

Question 5 Exercise 2C

A car starting from rest accelerates uniformly to acquire a speed 20km/h in 30 min. The distance travelled by car in this time interval will be:

(a) 600km

(b) 5km

(c) 6km

(d) 10km

Answer:

(b) 5km

v = u + at

20 = 0+ a(1/2)

a = 40km/h

S = ut + ½ at.t

= 0(1/2) + ½ (40)(0.25)

= 0+5 = 5km

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