Question

Define law of conservation of energy. Show that when an object is under free fall then its
total energy is conserved at the top and when it strikes to ground.
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Answer 1

Answer:

Law of conservation of energy states that energy can neither be created nor destroyed. It can only be transformed from one form to another

Refer the pictures .

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Answer 2

Answer:

Energy can neither be created nor be destroyed. We can convert one form of energy to energy

Expression

At top position

P.E=mgh

K.E=0

T.E=mgh+0=mgh

At low position

P.E=0

K.E=1/2mv²

Using equation of motion,

v²=u²+2as

  =2gh

thereforce,

K.E=1/2xmx2xgh

     =mgh

Therefore, Total Energy is conserved at every point for a freefall body

Explanation:

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