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Belly-flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 7000 J (relative to the surface of the pool).What is his kinetic energy when his potential energy reduces to 1000 J?

Respuesta :

Answer:

KEā‚‚ = 6000 J

Explanation:

Given that

Potential energy at top Uā‚= 7000 J

Potential energy at bottom Uā‚‚= 1000 J

The kinetic energy at top ,KEā‚= 0 J

Lets take kinetic energy at bottom level = Ā KEā‚‚

Now from energy conservation

Uā‚+ KEā‚= Uā‚‚+ KEā‚‚

Now by putting the values

Uā‚+ KEā‚= Uā‚‚+ KEā‚‚

7000+ 0 = 1000+ KEā‚‚

KEā‚‚ = 7000 - 1000 J

KEā‚‚ = 6000 J

Therefore the kinetic energy at bottom is 6000 J.

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