Identify the correct statement about work energy theorem

work done by all the conservative forces is equal to the decrease in potential energy.

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work done by all the forces except the conservative forces is equal to the change in mechanical energy.

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work done by all the forces is equal to the change in kinetic energy.

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work done by all the forces is equal to the change in potential energy.

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Solution

The correct options are
B work done by all the forces except the conservative forces is equal to the change in mechanical energy.
D work done by all the forces is equal to the change in kinetic energy.
The work-energy theorem is a generalized description of motion that states that the work done by the sum of all forces acting on an object is equal to the change in that object's kinetic energy. This principle of work and its relationship to kinetic energy is a core mechanical physics concept.

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S

t

t_{1}

t_{2}

A

B

A

B

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

U_{B} = 30 J

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