Two persons manage to push a motorcar of mass | vedclass

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Question

(A) Mass of the motorcar $(m)$ $= 1200 \, kg$.When two persons push the car at a uniform velocity,the net external force is zero. This means the force

Vedclass · Accepted Answer

$240$

Vedclass · Answer

(A) Mass of the motorcar $(m)$ $= 1200 \, kg$.When two persons push the car at a uniform velocity,the net external force is zero. This means the force applied by the two persons is exactly balanced by the frictional force $(f)$.So,$2F = f$,where $F$ is the force applied by each person.When three persons push the car,the total applied force is $3F$. The net force $(F_{net})$ causing acceleration is the total applied force minus the frictional force:$F_{net} = 3F - f = 3F - 2F = F$.According to Newton's second law of motion,$F_{net} = m 	imes a$.Given $a = 0.2 \, m \, s^{-2}$,we have:$F = 1200 \, kg 	imes 0.2 \, m \, s^{-2} = 240 \, N$.Therefore,each person pushes the motorcar with a force of $240 \, N$.

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