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Chapter 8 Motion Solutions

Question - 11 : -
A train starting from a railway station and moving with uniform acceleration attains a speed 40 kmh-1 in 10 minutes. Find its acceleration.

Answer - 11 : -

Here, initial speed, u = 0

Question - 12 : -
What is the nature of the distance-time graphs for uniform and non-uniform motion of an object?

Answer - 12 : -

When the motion is uniform, the distance-time graph is a straight line with some slops. When the motion is non-uniform, the distance time graph is not a straight line.

Question - 13 : -
What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?

Answer - 13 : -

When distance-time graph of an object is a straight line parallel to the time axis, distance of the object at every instant of time is the same. Therefore, the object must be at rest.

Question - 14 : -
What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?

Answer - 14 : -

When speed-time graph of a body is a straight line parallel to the time axis, speed of the body at every instant of time is the same. It means the body is moving with a uniform speed. There is no acceleration at all.

Question - 15 : -
What is the quantity which is measured by the area occupied below the velocity-time graph ?

Answer - 15 : -

Area occupied below the velocity-time graph is a measure of the distance travelled by the body or the displacement of the body.

Question - 16 : -
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 - 16 : -

Question - 17 : -
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.

Answer - 17 : -

Here, initial speed,

Question - 18 : -
A trolley, while going down an inclined plane, has an acceleration of 2 cm/s2 starting from rest, what will be its velocity 3 s after the start?

Answer - 18 : -

Question - 19 : -
A racing car has a uniform acceleration of 4 m s’2. What distance will it cover in 10 s after start?

Answer - 19 : - Here, a = 4 m s-2,t = 10 s, u = O.

The distance covered in 10 s by the car is 200 m.

Question - 20 : -
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?

Answer - 20 : - u = 5 m s-1, v = 0, a = -10 m s-2

















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