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A metre scale of mass 200 g, is lying o...

A metre scale of mass 200 g, is lying on a horizontal table. What is the work done by student in making it stand vertically on one of its ends?

A

2J

B

1.5J

C

1J

D

2.5J

Text Solution

Verified by Experts

The correct Answer is:
C
Both of them have the same K.E. when their engines stopped working. The K.E. is used for doing work against the force of friction.
Force of friction `F_(s)=muR=mu mg" i.e, it is "alpha` mass of the vehicle.
`="Frictional force " xx "Displacement"`
`therefore W=mumg xx s therefore s=(W)/(mumg)`
Thus, `s alpha 1/m,` where m is the mass of the vehicle.
As `M_("truck") gt M_("car")` the distance `(d_(1))` travelled by the truck will be less than the distance `(d_(2))` travelled by the carb.
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