Question

Q.24
A block of mass 3 kg slides down a rough curved path from point A as shown. If it
stops at C, the work done by friction is:
m=3kg
20m
8m
Sm
A) -360)
B) -600 )
C) -240)
D) -450 )​

Answer 1

$\huge\underline{\underline{\bold{\red{A}\pink{n}\green{s}\blue{w}\orange{e}{r}}}}$

Since, the gravitational force is the conservative force .Hence work done by it doesn't depend on path.

From the law of conservation,

mgh =1/2mv^2 +work done by friction

➙ work done by friction = mgh-1/2mv^2

=3×10×2-1/2×3×16

=60-24

=36j.