Physics Work & Energy NUMS 2024
PMDC Verified Question 15 of 108
When dolphin leaves the water it has lots of kinetic energy. At its highest point it's energy is:
A
Kinetic energy
B
Potential energy
C
Elastic potential energy
D
Neither kinetic energy nor potential energy
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Potential energy
Concept:

By the conservation of mechanical energy in projectile/vertical motion, kinetic energy is traded for gravitational potential energy as an object rises.

Formula:

$$ K.E_{\text{initial}} = P.E_{\text{top}} $$

Solution:

  • When the dolphin jumps straight up, it decelerates due to gravity until its vertical velocity hits zero at the peak of the jump.


  • At this exact highest point, all of its initial upward Kinetic Energy has been converted into Gravitational Potential Energy.


Why other options are incorrect:

If it jumps at an angle, it retains some horizontal K.E, but the primary energy conversion defining the "highest point" is the maximization of Potential energy. It is not elastic, nor is it zero.

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