In a longitudinal wave, particle displacement isperpendicular to the direction of wave motionparallel to the direction of wave motionopposite to the direction of wave motionabove the direction of wave motion

In a longitudinal wave, particle displacement is  parallel to the direction of wave motion.

(In a transverse wave, particle displacement is perpendicular to the direction of wave motion .)

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle