The law of conservation of mechanical energy is valid:

1.	The law of conservation of mechanical energy is valid:
A.	Irrespective of the mature of force held
B.	In gravitational field
C.	3 and 4
D.	Only if the force is tangential to the trajectory.
Answer» D. Only if the force is tangential to the trajectory.

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The law of conservation of mechanical energy is valid:

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