can any object have mechanical energyveven if its momentum is zero?
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yes
Momentum is the product of mass and velocity of a body, for a body mass never be zero but velocity can be zero if a body is at rest, So if a body is at rest its momentum is zero but if it is in rest at a height it possesses gravitational potential energy hence mechanical energy.
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yes...............
mmechanical energy = eK + eP
= if its momentum is zero
eK = 0 but eP can be greater than 0
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