(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Define Displacement.

Give two differences between displacement and distance.

Give an example of a body which covers a certain distance, but its displacement is zero.

Copy the following table and fill in the blank spaces.

A car covers 90 km in `1 1/2` hours towards east. Calculate

1. displacement of car,
2. its velocity in (a) kmh⁻¹ (b) ms⁻¹.

A racehorse runs straight towards the north and covers 540 m in one minute. Calculate

1. displacement of the horse,
2. its velocity in (a) ms⁻¹ (b) kmh⁻¹.

Draw displacement – time graph for the following situation:

When a body is moving with uniform velocity.

Draw displacement – time graph for the following situation:

When a body is moving with variable velocity.

How can you find the following?

Velocity from a displacement – time graph.

How can you find the following?

Displacement from velocity – time graph.

Can you suggest the kind of motion of a body from the following distance – time graph?

Can you suggest the kind of motion of a body from the following distance – time graph?

Can you suggest the kind of motion of a body from the following distance – time graph?

From the displacement – time graph shown given below calculate:

1. Average velocity in the first three seconds.
2. Displacement from the initial position at the end of 13 s.
3. Time after which the body is at the initial position,
4. Average velocity after 8 s.

From the displacement – time graph shown given below calculate :

1. Velocity between 0 – 2 s.
2. Velocity between 8 s – 12 s.
3. Average velocity between 5 s – 12 s.

A motorbike running at 90 kmh⁻¹, is slowed down to 54 kmh⁻¹ by the application of brakes, over a distance of 40 m. If the brakes are applied with the same force, calculate

1. total time in which bike comes to rest
2. total distance travelled by bike.

A motor car slows down from 72 kmh⁻¹ to 36 kmh⁻¹ over a distance of 25 m. If the brakes are applied with the same force
calculate

1. total time in which car comes to rest
2. distance travelled by it.