Question

At two positons kinetic energy and potential energy of a particle are `K_(1) =10J: U_(1) =-20J, K_(2) = 20 J, U_(2)=-10 J`. In moving from 1 to 2 .
A. work done by conservative forces is positive.
B. work done by conservative forces is negative.
C. work done by all the forces is positive .
D. work done by all the forces is negative.

Answer 1

Correct Answer - B::C
Work done by conservative frtces
`=U_(i) -U_(f)=-20+10=-10 J`
Work done by all the forces,
`K_(f)-K_(i)=20-10 =10 J`