A: Work energy theorem is valid for a system in presence of all types of forces (external or internal conservative or non conservative)

B: In an isolated system total energy is always conserved while the mechanical energy is conserved only when the forces are conservative

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A is false B is true

A is true B is false

Both A and B are true

Both A and B are false

answer is C.

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Detailed Solution

In the presence of any type of force work energy theorem is valid as long as we are taking the work done by the resultant force.

Energy conservation is always valid. In a conservative force field only mechanical energy is conserved.

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