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Questions  

A 3 kg block is projected with a velocity of 4 m/s along a horizontal rough surface. The block stops after travelling some distance. The work done by frictional force is 

a
18 Joule
b
-12 Joule
c
32 Joule
d
-24 Joule

detailed solution

Correct option is D

By work energy theoremwork done by frictional force = change in kinetic energy=0−12×3×(4)2J=−24 Joule

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