. A package sitting on a shelf is knocked off. The velocity of the box just before it hits the floor is 8.5 m/s. Calculate the height of the shelf using;
A displacement/velocity/acceleration equation
Conservation of energy
and hence show that these two methods produce the same answer.
(A) v=gt
t=v/g
h=gt²/2 =gv²/2g²=v²/2g
(B)
mv²/2 = mgh
h= v²/2g