The way you change the speed of a wave is to: a
Change it's medium
b
Change it's energy
c
Transfer it to a new position
d
Apply a force

transfer it to a new position

A.) Change it's medium

Explanation:

whenever a wave travels from one medium to another, then due to difference in optical density of the two mediums, the speed of wave changes.

for example :

when a wave travels from air to water, water is more optically denser hence it's speed decreases, this also leads to refraction ( bending of light )

a person with a mass of 106kg has a weight of 1060n

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards