Question

why speed of cyclone reduces on reaching land​

Answer 1

Explanation:

The increased friction over land acts as a somewhat obstacle, i.e. in the form of bushes, trees and houses and buildings, thus decreasing the speed of sustained winds. These sustained winds become weaker because of the dampening effect of larger roughness i.e. over land versus a relatively smooth ocean.

Answer 2

Answer:

When a tropical cyclone makes landfall, the eye closes in upon itself due to the weakening process, which causes surf to decrease. Maximum sustained winds will naturally decrease as the cyclone moves inland due to frictional differences between water and land with the free atmosphere.