a girl runs around a square track of side 30m and she completes 1 round in 30 secs,calculate her distance and displacement in 75secs
Answers
Answer:
Distance in circular motion = Circumference of the circle
As we know, circumference of the circle is denoted by
Distance=
2 × × 20
= 125.7 metre
This means he completed one round in 40 seconds. Thus, he takes 40 seconds to complete one round
Now for 3 minutes= 180 seconds
now taking the ratio,
Thus,
x=565.7
Thus he covered a distance of 565.7 metre in 3 minutes
for displacement let's divide the covered distance by circumference
=565.7/125.7
=4.500
Now converting this in words
this means he has completed 4 rounds and have completed 1/2 round extra, he is on a point parallel to his starting point
thus he is not on his starting position, thus his displacement is not zero. Drawing a line from starting position to his current position, it will pass through the centre, it is the diameter
Displacement= 2×20
= 40m
ANS Distance covered in 3 minutes is 565.7 m and displacement is 40m
Answer:
300m
Explanation:
total distance=perimeter of sqaure track
=4×30
=120m
In 30 sec,she runs 120 m
In 1 sec,she would run 120/30 m
In 75 sec, she would run 120/30×75
=300m