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    				| 1. | 
                                    Two particles start moving from same position on a circle of radius 20 cm with speed40π23.m/s and 36π m/s respectively in the same direction. Find the time after which theparticles will meet again. | 
                            
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Answer»  Relative speed = 40π - 36π = 4π m/sec Circumference of the circle = 2π * 20 = 40π cm =0.4π m Time after which they again meet = 0.4π / 4π = 0.1 sec  | 
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