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Two persons manage in push a motor car o...

Two persons manage in push a motor car of mass 1200 kg at a uniform velocity along a level road.The same motorcar can be pushed by three persons to produce an acceleration of 0,2m`s^(-2)`.With what force does each person push the motorcar?(Assume that all persons push the motorcar with the same muscular effort.)

Text Solution

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Here , =1200 kg ,a=0.2 `ms^(-2)`
Let the force applied by each person by F.
Two persons manage to push the car.
It means 2 F force is just balanced by the friction force due to the road.
Three persons apply 3F force and the motorcar accelerated i.e.,3F-2F excess force accelerates the car.
F=ma=`1200xx0.2=240N`
Each person pushes the motorcar with a force of 240N
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