Which of the following remains constant during the motion of a projectile fired from a planet? A. Momentum

B. Kinetic energy

C. Horizontal component of velocity

D. Vertical component of velocity

28. evolution

29. environment, survive, offspring  

explanation:

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

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