Holidays Home Work - Class - IX

 PHYSICS

1.  Car A is moving at a speed of 20 m/s and Car B is moving at a speed of 65 km/h. Which car is faster?
2. A train is moving on a straight and levelled track at a speed of 54 km/h and passes an electric pole in 2 seconds. Find the time taken to pass a bridge of length 540 m
3. Chitra goes to school at a speed of 15 km/h and returns at a speed of 10 km/h. Calculate her average speed.
4. On a 90 km track a train travels the first 30 km at a speed of 30 km/h. How fast must the train travel next 60 km so as to average the speed of 60 km/h for the entire trip.
5. A bus is moving with a velocity of 108 km/h. On applying the brakes it comes to rest in 5 seconds. Find its retardation and distance covered by the bus before it comes to rest
6. A car is moving with a uniform speed of 72 km/h. The driver sees a child at a distance of 50m. He applies the brakes to stop the car just before the child. Calculate the acceleration
7. Find the initial velocity of the car which is stopped in 10 seconds by applying brakes. The retardation due to brakes is 2.5 m/s²
8. A person completes one round of square field of side 10 m in 40 s. Calculate the magnitude of displacement at the end of 2 min 20 seconds
9. An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be his distance and displacement at the end of 2 min. 20 seconds
10. A train 50 m long passes over a bridge 250 m long at a speed of 12 km/h. How long will it take to completely pass over the bridge
11. A truck is moving at a speed of 108 km/h, after one second its speed drops to 72 km/h. Calculate the retardation of the truck and also the distance covered in one second
12. A train runs at a speed of 36 km/h for 15 min, at 72 km/h for 10 min and at 18 km/h for 5 min. Calculate the average speed of the train
13.  A boy starting from rest, runs with a uniform acceleration for 5 seconds and covers a distance of 37.5 m. Calculate the acceleration of the boy and also his final velocity?  
14. A body covers 1/4^th of a circle with radius 20m. Find the ratio of its distance to displacement.
15. A body is moving with a velocity of 10 ms^-1. If the motion is uniform, what will be the velocity after 10s?
16. Can a body have zero velocity and still be accelerating?
17. Give one example to show that motion and rest are relative.
18. A body travels a distance of 15m from A to B and then moves a distance of 20m at right angles to AB. Calculate the total distance travelled and displacement.
19. A car travels 100 km at a uniform speed of 40kmh^-1 and the next 125 km at a uniform speed of 50 kmh^-1. Find average speed of car.
20. A car travels along a straight line for first half time with a speed of 40kmh^-1 and the second half time with a speed of 60kmh^-1. Find the average speed of the car.