Question

To have momentum, an object must be ______.
a. heavy c. massive
b. moving d. accelerating

Answer 1

at least it must be moving, according to the equation P = m*v.

Answer 2

it must be moving and must have a velocity

Answer 3

If you base your answer on the definition of momentum as p = mv , then one could say that for p to be non zero you need m to be non zero and v to be non zero, in other words the object must be massive and moving to have momentum.

How an object could exist without being massive is another question : )

Answer 4

Object must be massive.( If the object acquires some momentum due to a force then its velocity increases.)

Answer 5

Just an interesting thought on this, not intended as part of the answer to the question -
particles of light, photons, carry momentum.