Suppose you had a spaceship so fast that you could make a roundtrip journey of 1 million light-years (in earth's reference frame) in just 50 years of ship time. if you left in the year 2030, you would return to earth

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

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray