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Q.

A train starting from a railway station and moving with uniform acceleration attains a speed of 40 km/h in 10 minutes. What is its acceleration?


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a

-0.0185 m/

b

0.0185 m/

c

0.0185 km/

d

-0.0185 km/ 

answer is B.

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Detailed Solution

The acceleration is 0.0185 m/.
Initial speed of the train, = 0 km. (Because the train starts from the rest)
Final speed of the train, = 40 km/h
= (5/18) × 40
= 11.11 m/s.
Time taken to attain the speed = 10 minutes
= 10 × 60
= 600 sec.
Acceleration =a.
Formula: = (v-u)t
Putting the values, we get
= (11.11-0)600
= 0.0185 m/
 
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