Answer:
KE = PE at half the table Height:
Explanation
AT ANY POINT IN THE BOOK'S FALL,
TOTAL E = PE +KE
THE TOTAL E IS CONSTANT
Before the book is pushed off, the total energy is potential
TOT E=PE =MGH
BEFORE THE BOOK HITS THE GROUND, THE TOTAL E IS KINETIC
TOT=KE = MVXV/2
WHEN KE = PE
KE+PE = MGH (STARTING ENERGY SINCE E IS CONSERVED)
OR PE+ PE = MGH
OR MGH' + MGH' =MGH
OR 2H' =H
H' (NEW HEIGHT) =H/2
The point during a fall where the potential and kinetic energy be equal will
be at the midpoint of the initial height.
The object first of all possesses potential energy when at rest and then
kinetic energy when in motion.
When KE = PE
We can deduce that KE+PE = MGH and PE+ PE = MGH
this means that MGH + MGH=MGH and 2H =H
The new height will then be H =H/2 which is the midpoint of the initial
height.
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