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A body completes one round of a circle of radius R in 20 seconds. What is the ratio of distance to displacement of the body after 10 seconds |
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Answer» Explanation: given the body completes a full revolution in 20 seconds 2*pi *r =20 seconds [CIRCUMFRENCE of circle] therefore distance TRAVELLED in 10 seconds=2*pi*r*10/20=pi*r=half of the circle therefore distance travelled in 10 sec=pi*r displacement in 10 sec=2r [DIAMETRICALLY opposite points] therefore ratio=pi*r/2r=pi/2 =3.14/2=1.57 |
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