An athletic can complete one round of a truck of radius R in 40sec. His displacement after 2 minutes 20 seconds will be : (a) 2R (b) 7R (c) 2πR (d) 7πR
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Explanation:
althletic need 40s to complete one round
therefore althletic need 2 min to complete 5 rounds
displacement is zero in 5 rounds as starting and ending point is same
in next 20 sec he travel half round
displacement=2r
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