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Page No 109: - Chapter 8 Motion class 9 ncert solutions Science - SaraNextGen [2024]


Question 1:

A bus starting from rest moves with a uniform acceleration of 0.1 m s−2 for 2 minutes. Find (a) the speed acquired, (b) the distance travelled.

Answer:

(a) 12 m/s (b) 720 m

(a) Initial speed of the bus, u = 0 (since the bus is initially at rest)

Acceleration, a = 0.1 m/s2

Time taken, t = 2 minutes = 120 s

Let v be the final speed acquired by the bus.

https://img-nm.mnimgs.com/img/study_content/curr/1/9/8/120/497/Chapter%208_html_1138e18d.gif

v = 12 m/s

(b) According to the third equation of motion:

v2 − u2 = 2as

Where, s is the distance covered by the bus

(12)2 − (0)2 = 2(0.1) s

= 720 m

Speed acquired by the bus is 12 m/s.

Distance travelled by the bus is 720 m.

Also Read : Page-No-110:-Chapter-8-Motion-class-9-ncert-solutions-Science

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