What do you mean by term projectile motion?​

Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. ... (This choice of axes is the most sensible, because acceleration due to gravity is vertical—thus, there will be no acceleration along the horizontal axis when air resistance is negligible.)

Explanation:

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a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.