Q19 of 47 Page 8

A trolley, while going down an inclined plane, has an acceleration of 2 cm s-2. What will be its velocity 3 s after the start?

Given,

Initial velocity, u = 0


Final velocity, v =?


Acceleration, a = 2 cm/s2


And,


Time, t = 3 s


We know that,


v = u + at


= 0 + 2 × 3


= 6 cm/s


Therefore, after 3 seconds the velocity of trolley will be 6 cm/s.

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(a) From A to B


(b) From A to C

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An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?

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A train is travelling at a speed of 90 km h-1. Brakes are applied so as to produce a uniform acceleration -0.5 ms-2. Find how far the train will go before it is brought to rest.

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A bus starting from rest moves with a uniform acceleration of 0.1 ms-2 for 2 minutes. Find:

(a) The speed acquired.


(b) The distance travelled.