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An ant crawls on a wheel of radius 40 cm. Find the i) distance , ii) displacement of it when it completes half a rotation ?

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B.Sc(Maths).

Displacement covered is 80cm, distance covered is 125.71cm
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expert in all subjects from 1-xii

Distance travelled by ant is 125.6cm.
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Headstart to assured 95+ score in math

125.6 and 80 cm
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Engineer

Distance-:circumference/2=125.7cm approx. ,displacement: diameter/2=80cm.
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M.A.(Maths.) , CAIIB from Indian Institute of Bankers Bombay

Distance covered as Sh. Jaganshyam is ok i.e 125.6cm. But displacement is equal to the Diameter of the wheel i.e. 40x2= 80cm that is the distance from one pt. to another pt.
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Tutor

Distance covered for half the rotation is pi*r . = 3.14* 40 cm =125.6 cm Displacement is the least distance between the end point and the starting point, which here is just the diameter = 80cm.
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

Distance covered for half rotation with radius 40 cm = 22/7x40 = 125.6 cm and Displacement (shortest distance means change of position)= 2 x radius = 2 x 40 = 80cm
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Abhishek S ( M.Pharm.MBA) tutor for IB/International/IGCSE

Distance= 3.14*40*2
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Your tutor friend.

Yes , its a wheel. But the ant has crawled half the rotation. So, the distance will be 2*Pi*radius / 2 = Pi * r = 3.14*40CM= 125.60cm. But the displacement will be 2R = 80cm.
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Teacher

Distance is about 126 cm, as indicated in the above two replies. The displace is the length of the line joining the initial and final points, which is nothing but the diameter of the wheel. So, the displacement is 80 cm.
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