Question

44. Belly-flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000 J (relative to the surface of the pool). What is his kinetic energy when his potential energy is reduced to 1000 J

Answer 1

Answer:

9000 J

Explanation:

Potential energy at the top = 10,000 J

Final potential energy = 1000 J

use the conservation of mechanical energy

Potential energy at top + kinetic energy at top = potential energy at a point + kinetic energy at that point.

10000 + 0 = 1000 + kinetic energy

kinetic energy = 10000 - 1000

kinetic energy = 9000 J

Thus, the kinetic energy is 9000 J.