Here the same stone is being accelerated vertically upward. (a) Draw force vectors to some suitable scale showing relative forces acting on the stone. (b) Which is the longer vector, and why?

Problem 45E Solution 45E Step 1 : Let us consider the pictorial representation of the stones Step 2 : When the object is tossed up vertically, with an initial velocity v it will accelerate in i direction opposite to gravitational force and reaches it maximum position where the velocity becomes 0 , at this point the stone has velocity vector v which is pointed upward But the stone is acted upon by the gravitational force also which is directed towards the center of the earth, hence the acceleration vector a will directed in same direction of the motion of the rock that vertically upward And when the velocity become 0 and the rock starts to travel downward it will have only acceleration a Hence the rock will have 2 vectors v and a while accelerating in vertically upward