Question

A particle of mass m is pulled slowly along an arbitrary
curved surface without acceleration as shown in figure.
Coefficient of friction between surface and particle is u.
Then :
column l

(A)Work done by the frictional force
(B)Work done by the gravitational force
(C)Work done by the external force
(D)change in kinetic energy of the particle


Column Il

(p) -mgh
(q) -umg!
(r) umg/+ mgh
(s) zero
​

Answer 1

ANSWER.....

A. S

B. P

C. Q

D. R

Answer 2

work done by frictional force will be zero

work done by gravitational force will -mgh

work done by external force will -umg

and work done by kinetic energy will umg /+mgh

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