Engineering Mechanics
The total energy possessed by a system of moving bodies

Is constant at every instant
Is minimum in the start and maximum at the end
Is maximum in the start and minimum at the end
Varies from point to point

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Engineering Mechanics
The static friction

Always acts in a direction, opposite to that in which the body tends to move
Is independent of the area of contact, between the two surfaces
All of these
Bears a constant ratio to the normal reaction between the two surfaces

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