FALSE – If an object does NOT have momentum, then it definitely does NOT have kinetic energy. However, it could have some potential energy and thus have mechanical energy.

Thus, the potential energy of a system of two equal negative point charges of 2μC each held 1 m apart in air is3.6×10−2J. The correct option is D.

Since the potential at each point of an equipotential surface is the same, the potential does not change while we move a unit positive charge from one point to another. Therefore work done in the process is zero.

Answer Expert Verified the two or more object is able to have kinetic energy but zero momentum. for example, two identical object move with the same velocity but different direction resulting in the total momentum to be zero. but the total kinetic energy is not zero.

Since kinetic energy is12mv2and momentum ismv, an object that has kinetic energy mustalso have momentum.It is possible, however, for a system of objects to have nonzero kineticenergy but zero momentum. Since there is no change in momentum, there is also no impulse.

For instance, if an electron and a positron fly at each other from opposite directions with equal speeds, their total momentum is zero. After the particles annihilate each other and convert their mass totally to energy, they must turn into something that has zero total momentum.

Light indeed carries energy via its momentum despite having no mass. In contrast, for a particle with no mass (m = 0), the general equation reduces down to E = pc. Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum.