Question

3. A particle covers hall of the circle of radius r. The
displacement and distance of the particle are,
respectively
(a) o r (b) 2r, ar (c) 2r, 2er (d) r,2ur.
lenament to the distance is :​

Answer 1

Answer:

Answer:the answer is c)2r ,2πr

c)2r ,2πr[tex]

Assuming that "hall" here is just a small typing mistake,which happens with everyone,and considering "hall" to be "half".

Answer 2

If the Particle covers the hall of radius ' r '.

Then if it completes One Round -

• The Distance will be the Circumference of Circle which is 2πr.

• The Displacement will be 0 as the particle came back to its starting position. So, the final position coincides with the initial position. Hence, Displacement is 0.

If it Completes Half Round-

• Distance is πr as
• $2\pi \: r \times \frac{1}{2} = \pi \: r$
• Displacement is 2r because the particle covered half the distance of the circle. So we know Displacement is the shortest distance between Initial and final
• position. So
• $r + r = 2r$