Answers

2014-08-01T16:56:36+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Athlete angular speed = ω = 2 π / 40  = π / 20  sec^-1
the angular position Ф after 2 min 20 sec = π/20 * 140 = 7 π  This is equivalient to π.
So he/she is at the opposite end of the circular track from where he/she started.
Displacement = - 2 R = - diameter.    -ve.


0
2014-08-01T21:06:04+05:30
Listen (i mean read)

2 minute 20 sec (in seconds)= 120 + 20 = 140 seconds 

Since the object (athelete) takes one round in 40 sec then 

By calculation and some common sense we could say that after 140 sec he would complete half round. which is equal to diameter.
0
  • Brainly User
2014-08-02T13:25:32+05:30
Speed = 2πr/40 m/s
let r = R
so distance covered in time 140 sec = 2πr/40 × 140
                                                     =  7πr m
so (6πr +πr) m
so displacement = 2R
0