At the highest point on trajectory of a projectile, itsA. potential energy is minimumB. kinetic energy is maximumC. total energy is maximumD. kinetic energy is minimum.

At the highest point on the trajectory of a projectile, its kinetic energy is minimum, which means the correct option is:

D. Kinetic energy is minimum.

At the highest point, the projectile momentarily comes to a stop before it starts descending. This means its velocity is momentarily zero, and since kinetic energy is directly proportional to the square of velocity (KE = 0.5 * m * v^2), the kinetic energy is at a minimum.

Potential energy, on the other hand, is at its maximum at this point because the projectile is at its highest elevation, so gravitational potential energy (PE = m * g * h) is at its peak.

Total energy, which is the sum of kinetic and potential energy, remains constant throughout the projectile's motion due to the conservation of mechanical energy, so it's not necessarily at its maximum at the highest point; it depends on the initial conditions of the projectile's motion.