A flaming boulder is to be launched horizontally from a tower with an initial velocity of 30 m/s. From what
height should it be launched if the required range is 80 meters?

the answer is a 3.8cm

explanation:

answer; equivalent to a one(1) horsepower motor;

im guessing the west of station b

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