Why the motion of a falling object from height is a linear motion hellppp

linear motion means motion in only one direction and in free fall the object can only move downwards i.e only one direction hence it is a linear motion

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

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

c) both a and b.