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

Figure (a) shows the velocity-time graph for the motion of a body. Use it to find the displacement of the body at t = 1 s, 2 s, 3 s and 4 s, then draw on Figure (b), the displacement-time graph for it.

(a)	(b)

Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.

Compare the distance travelled in part BC with the distance travelled in part AB.

Figure given below shows a velocity-time graph for a car starting from rest. The graph has three parts AB, BC and CD.

State how is the distance travelled in any part determined from this graph .

A ball moves on a smooth floor in a straight line with uniform velocity 10 m s^-1 for 6 s. At t = 6 s, the ball hits a wall and comes back along the same line to the starting point with the same speed. Draw the velocity-time graph and use it to find the total distance travelled by the ball and its displacement.

Figure shows the velocity-time graph of a particle moving in a straight line.

(i) State the nature of motion of particle.

(ii) Find the displacement of particle at t = 6 s.

(iii) Does the particle change its direction of motion?

(iv) Compare the distance travelled by the particle from 0 to 4 s and from 4 s to 6 s.

(v) Find the acceleration from 0 to 4 s and retardation from 4 s to 6 s.

Write an expression for the distance S covered in time t by a body which is initially at rest and starts moving with a constant acceleration a.

A car starting from rest accelerates uniformly to acquire a speed 20 km h^-1 in 30 min. The distance travelled by a car in this time interval will be _____________

A body starts from rest with uniform acceleration 2 m s^-2. Find the distance covered by the body in 2 s.

A body starts with an initial velocity of 10m s^-1 and acceleration 5 m s^-2. Find the distance covered by it in 5 s.

When brakes are applied to a bus, retardation produced is 25 cm s^-2 and the bus takes 20 s to stop. Calculate -

1. The initial velocity of the bus
2. The distance travelled by bus during this time.

A car travels a distance 100 m with constant acceleration and average velocity of 20 ms^-1. The final velocity acquired by the car is 25 ms^-1.

Find

(i) The initial velocity.

(ii) Acceleration of the car.

State Newton's first law of motion.

Give qualitative definition of force on the basic of Newton's first law of motion.

Explain the following :
After alighting from a moving bus , one has to run for some distance in the direction of bus in order to avoid falling .

How does Newton's second law of motion differ from the first law of motion?

State the laws of reflection and describe an experiment to verify them.

According to the law of reflection :