A ball thrown vertically upward reaches a maximum height at 50m above the level of projection, calculate the time taken to reach the height, the speed of throw..

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

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

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