What part of the velocity changes when you move in a circle? the magnitude or the direction?

Explanation:

The direction of the velocity is constantly changing when you move in a circle. In fact, that is the reason there is centripetal acceleration when you are moving in a circle because the velocity vector is constantly changing direction.

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

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.