Advertisements
Advertisements
Question
Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
Advertisements
Solution
`"Average speed"="Total distance covered"/"Total time taken"`
`"Average velocity"="Displacement"/"Total time taken"`
If the total distance covered by an object is the same as its displacement, then its average speed would be equal to its average velocity.
APPEARS IN
RELATED QUESTIONS
Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging?
- from A to B and
- from A to C?
Abdul, while driving to school, computes the average speed for his trip to be 20 km h−1. On his return trip along the same route, there is less traffic and the average speed is 30 km h−1. What is the average speed for Abdul’s trip?
Change the speed of 6 m/s into km/h.
Fill in the following blank with suitable word:
The physical quantity which gives both, the speed and direction of motion of a body is called its……………
State whether speed is a scalar or a vector quantity. Give reason for your choice.
Arrange the following speed in increasing order (keeping the least speed first):
An athlete running with a speed of 10 m/s.
Arrange the following speed in increasing order (keeping the least speed first
A scooter moving with a speed of 30 km/h.
A train is moving with a velocity of 90 km h-1 . It is brought to stop by applying the brakes which produce a retardation of 0.5 ms-2 Find :
(i) The velocity after 10 s , and
(ii) the time taken by the train to come to rest .
Draw a diagram to show the motion of a body whose speed remains constant, but velocity changes continuously.
A motorcyclist drives from A to B with a uniform speed of 30 km h–1 and returns back with a speed of 20 km h–1. Find its average speed.
