Question

A player completes a circular path of radius r in 40s. At the end of 2min 20sec, find the displacement?
(Ans is 3.5)
but I don't know how it comes...
pls help me guyzzz...

Answer 1

It takes 40 seconds to complete one revolution.

2 min 20 s = 140 s

Total number of revolutions in 140 seconds = 140/40 = 3.5

Now, we know that
It takes 3.5 revolutions after 140 seconds

3.5 revolutions = 3 revolutions + 0.5 revolution

Displacement after “n” revolutions is zero. Because initial and final point is same.

Displacement after 0.5 revolution = 2r
Because Shortest Distance between initial and final position after half revolution is 2r (= Diameter of circle)

So, Answer is 2r
3.5 is not Displacement. It’s number revolutions it takes after 2 min 20 seconds.

Answer 2

Answer:

displacement will be 2r because a player completes a circular track in 40s

in 140s he complete 3.5 rounds

So, he's displacement will be 2r.

I hope it will help u