Advertisements
Advertisements
Question
A boy walks from his classroom to the bookshop along a straight corridor towards North. He covers a distance of 20 m in 25 seconds to reach the bookshop. After buying a book, he travels the same distance in the same time to reach back in the classroom. Find (a) average speed, and (b) average velocity, of the boy.
Solution
a) Distance travelled is the length of the actual path covered.
Total distance covered in going and coming back :
= (20 + 20) m
= 40 m
Total time taken, = (25 + 25) s
= 50 s
So, we can calculate average speed as :
`"Average Speed" = "Total distance travelled"/"Time"`
Average speed for the entire journey ;
= `40/50`
= 0.8 m/s
APPEARS IN
RELATED QUESTIONS
A particle is moving in a circular path of radius r. The displacement after half a circle would be :
Complete a sentence and explain it.
The minimum distance between the start and finish points of the motion of an object is called the ______ of the object.
Figure ahead represents the displacement - time sketch of motion of two cars A and B . Find :
(i) the distance by which the car B was initially ahead of car A.
(ii) the velocities of car A and car B.
(iii) the time in which car A catches car B.
(iv) the distance from start when the car A will catch the car B.
A body starts from rest with uniform acceleration 2 m s-2. Find the distance covered by the body in 2 s.
Draw displacement – time graph for the following situation:
When a body is moving with variable velocity.
Write two differences between distance and displacement.
Calculate the distance and displacement in the following case:
An object is thrown vertically upwards. It rises upto a height H and then returns to its initial position. Calculate
The displacement of the object.
Is distance covered during nth second more than the distance covered in n seconds?
Write a note on the following:
Nautical mile
