Answer: Mechanical wave travels slowest in gases.
Step-by-step explanation:
Mechanical wave is a wave in which there is a oscillation of the matter. Therefore, there is a transfer of the energy through the medium.
The wave travels over long distances. Mechanical waves are of two types: Longitudinal wave and Transverse wave. Mechanical wave requires a medium to travel. It can travel in the solid, liquid and gases.
It travels fastest in solid and slowest in the gases due to the packaging of the molecules of the state. The molecules of the gases are not tightly packed so therefore it is hard for the particle to transfer energy.