Question

state a situation in which an object has machanical energy even if momuntum is zero

Answer 1

Answer: 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.

I hope this helps you.....