I am throwing a ball to Andrea Ghez who is on a ledge, 9.00 meters directly above me. I throw it straight up, so that it just reaches her (the velocity of the ball is zero when caught). a) What initial velocity do I need (in m/s)?
b) How long does it take to reach Andrea (in seconds)?

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

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr