sir/maam, i was given a question frm ur website and i've a doubt in it.the question was "A particle is moving along a circle of radius R such that it completes one revolution in 40 seconds. What will be the displacement after 2 minutes 20 seconds?" plz explain...

Asked by shravan s | 19th Jun, 2013, 07:37: PM

Expert Answer:

Particle completes 1 revolution in 40 sec.
In 2 min 20 sec (i.e. 140 sec), it will complete 3.5 revoltions.
i.e. the particle will complete 3 full revolutions and will now be at a point diametrically opposite to the initial point.
So, the displacement, which is the shortest distance between the initial and final point is R+R = 2R.

Answered by  | 19th Jun, 2013, 11:17: PM

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