Pls help!! While hiking in the mountains, you shout to a friend. You hear your
voice echoing back to you three times. How can you explain what happened?

50 inches should be the resultant vector

uranium fissions/breaks up giving out energy and neutrons

real, smaller and upside-down.   so the answer should be 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