At two positions kinetic energy and potential energy of a particle are
$K_{1} = 10 J, U_{1} = - 20 J; K_{2} = 20 J, U_{2} = - 10 J$
In moving from 1 to 2,

work done by conservative forces is positive

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work done by conservative forces is negative

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work done by all the forces is positive

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work done by all the forces is negative

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Solution

The correct options are
B work done by conservative forces is negative
D work done by all the forces is positive
Work done by conservative forces
$= U_{i} - U_{f} = - 20 + 10 = - 10 J$
Work done by all the forces,
$= K_{f} - K_{i} = 20 - 10 = 10 J$

Suggest Corrections

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K_{A} = 70 J, U_{A} = - 50 J, K_{B} = - 20 J

U_{B} = 30 J

Work done by Conservative force is Positive,

Can I say Kinetic Energy increases?

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