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Romashka [77]
3 years ago
7

12. In which of the positions shown in the picture, will Joshua have both potential and kinetic energy?​

Physics
1 answer:
Zielflug [23.3K]3 years ago
8 0

Answer:

<em>Answer: D. Only R</em>

Explanation:

<u>The Principle Of Conservation Of Mechanical Energy</u>

In the absence of friction, the total mechanical energy is conserved. That means that

Em=U+K is constant, being U the potential energy and K the kinetic energy.

At the top of the path (point Q), Joshua is at rest but his height is at a maximum. Thus his kinetic energy is zero.

At point P, Joshua is at the minimum level (potential energy zero) and his speed is at a maximum.

At point R, Joshua has some height and some speed which means he has both types of energy.

Answer: D. Only R

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