Unlike velocity, speed is scalar, which means it is described by only.

It can be described on by its magnitude

MAGNITUDE

Explanation:

Vector quantities are described by their magnitude and their direction both

so all vector quantities like velocity etc need direction and magnitude both like velocity is given as 60 km/h towards North direction

But for scalar quantities we defined them only by their magnitudes

Like here if we define mass then we do not require any direction for its complete explanation.

so here correct answer will be

MAGNITUDE

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

e/c, where e is its total energy