Advertisements
Advertisements
प्रश्न
A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find:
The average speed,
The average velocity of the train.
उत्तर
Here, total distance = (200 + 200) km = 400 km
Total time taken = (2 + 3) h = 5 h
(i) Average speed = Total distance travelled/total time taken = `(400 "km")/(5 "h")` = 80 km h-1
(ii) Average velocity of the train is zero because the train stops at the same point from where it starts, i.e. the displacement is zero.
APPEARS IN
संबंधित प्रश्न
What do the following measure in a car ?
(a) Speedometer (b) Odometer
Arrange the following speed in increasing order (keeping the least speed first):
A bicycle moving with a speed of 200 m/min.
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 6 seconds ?
A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed acquired and the distance travelled in this time.
A car moving on a straight path covers a distance of 1 km due east in 100 s. What is the speed of the car?
A car accelerates at a rate of 5 m s-2. Find the increase in its velocity in 2 s.
A car is moving with a velocity 20 m s-1. The brakes are applied to retard it at a rate of 2 m s-2. What will be the velocity after 5 s of applying the brakes?
Draw a diagram to show the motion of a body whose speed remains constant, but velocity changes continuously.
A speeding car changes its velocity from 108 kmh−1 to 36 kmh−1 in 4 s. Calculate its deceleration in
- ms−2
- kmh−2.
