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Work done by a body is shown as in figur...

Work done by a body is shown as in figure . Calculate the work done during first 20 m distance covered .

Text Solution

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The work done W by a body when it covered a distance 20 m , will be the area under the graph of `(F to x)`

` :. { "Area of isosceles trapezoid OADE " } + "Area of triangle BDC "`
` = 1/2 (AD +OE) (DE) +1/2 (BD)(CD)`
` =1/2 (15+20)(10)+1/2 (5)(10)`
` = 175 +25`
= 200 J
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