English Medium Class 9 - CBSE Question Bank Solutions for Science

Arrange the following speed in increasing order (keeping the least speed first):

A bicycle moving with a speed of 200 m/min.

Arrange the following speed in increasing order (keeping the least speed first

A scooter moving with a speed of 30 km/h.

Write the formula for acceleration. Give the meaning of each symbol which occurs in it.

A train starting from Railway Station attains a speed of 21 m/s in one minute. Find its acceleration.

A snail covers a distance of 100 metres in 50 hours. Calculate the average speed of snail in km/h.

A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of tortoise in km/h ?

If a sprinter runs a distance of 100 metres in 9.83 seconds, calculate his average speed in km/h.

A motorcyclist drives from place A to B with a uniform speed of 30 km h^-1 and returns from place B to A with a uniform speed of 20 km h^-1. Find his average speed.

A motorcyclist starts from rest and reaches a speed of 6 m/s after travelling with uniform acceleration for 3 s. What is his acceleration ?

An aircraft travelling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound as 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’ ?

If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s², how long will it take to come to rest ?

Convert a speed of 54 km/h into m/s.

The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. How fast must the train travel the next 100 km, so as to average 70 km/h for the whole journey ?

A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.

A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds: 

What is its average speed ?

A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds:

How far does it travel in 1 second ?

A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds:
How far does it travel in 6 seconds ?

A car is moving along a straight road at a steady speed. It travels 150 m in 5 seconds:

How long does it take to travel 240 m ?

A car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Calculate the average speed for the whole journey.

A ball hits a wall horizontally at 6.0 m s^-1. It rebounds horizontally at 4.4 m s^-1. The ball is in contact with the wall for 0.040 s. What is the acceleration of the ball ?