How can a child care professional introduce children to classical music?
a. have them watch a clasical music video like an opera
b. allow them to interpret classical music through dancing
c. introduce the composers but not the music itself
d. use classical music during the music lesson only

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.