Chapter 7

NCERT
Class 9
Science
Solutions
3. A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km h–1 in 10 minutes. Find its acceleration.

Question:

A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km h–1 in 10 minutes. Find its acceleration.

Answer:

Time t = 10 minutes

        t = 10 x 60

        t = 600 sec

Initial velocity = u = 0 ms−1

Final velocity = v = 40 km h−1

Final velocity = v = (40 x 1000)/3600

Final velocity = v = 11.1 ms−1

Acceleration a = (v-u)/t

Acceleration a = (11.1 - 0)/600

Acceleration a = 0.0185 ms−2

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