1.

A boy runs around the boundary of a circular path of radius 4km in 1hour .find the speed of the boy in m/s

Answer»

6.9778 m/sExplanation:total DISTANCE = CIRCUMFERENCE of the circle = 2π R = 2 x 3.14 x 4000 m                                                                                    = 25120 mspeed = distance / time = 25120 m / 3600 s = 6.9778 m/s



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