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

12. In which of the positions shown in the picture, will Joshua have both potential-example-1
User Spyle
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4 votes

Answer:

Answer: D. Only R

Step-by-step explanation:

The Principle Of Conservation Of Mechanical Energy

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

User Keithmo
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