Solve the question . Question in the attachment
Answers
Answer:
(i) Distance travelled by the person from point A to point B is equal to the circumference of the semicircular path.
⇒ Distance = 2*π*r/2
⇒Distance = πr
- Hence, option (A) πr is the correct answer.
(ii) Displacement is the shortest distance between the final point and initial point.
•Here, the initial point is A and final point is B.
• The radius of the Circle is 'r'.
• Displacement from point A to O is r and from point O to B is also r.
•Therefore, the total displacement of the person from point A to B is 2r.
- Hence, option (C) 2r is the correct answer.
28(i)
According to the Question (from figure)
It is given that person moves round a circle of radius r from point A to B .
we need to calculate the distance covered by the person in moving from point A to B.
As from the figure we observe that he covered distance half of the circumference of circle .
- Circumference of circle = 2πr
so, the half circumference of the circle will be
➻ half circumference of the circle = 1/2×2πr
➻ half circumference of the circle = πr
- So ,the required option is (a) πr.
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(ii)
In this question we have to calculate the displacement of the person .
As we know that displacement is defined as the shortest path between two points .
From the given figure we observe that he travelled from point. A to B.
So , the displacement between A and B = AO + OB
➻ the displacement between A and B = r + r
➻ the displacement between A and B = 2r
- Hence, the displacement of the person will be 2r .So, the required option is (c) 2r .