# physics

a ball of weight 200 grams,is tied to the end of a cord and whirled in a horizontal circle of radius 0.6 m.if the ball makes five complete revolutions in 2 seconds,what will be the linear speed of the ball?

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1. since speed = distance/time, just plug in your numbers:

((2π*0.6)*5 m)/(2s) = 3π m/s

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2. Circumference = pi*D = 3.14*1.2m = 3.77 m.

5rev/2s. * 3.77m/rev = 9.42 m/s. = Linear speed.

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