Q3 of 30 Page 109

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.


More from this chapter

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1

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.

 2

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

 4

A racing car has a uniform acceleration of 4 m s-2. What distance will it cover in 10 s after start?

 5

A stone is thrown in vertically upward direction with a velocity of 5 m s-1. If the acceleration of the stone during its motion is 10 m s-2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?