1. The total energy is Kinetic
2. The ratio of potential energy to kinetic energy is constant
3. The sum of potential and kinetic is constant
A. 1 only
B. 2 only
C. 3 only
D. 1 and 2 only
Correct Answer:
Option C – 3 only
Explanation
The total energy at any point combination of the PE and KE
i.e. TEnergy = P.E + K.E
= mgh + ½ mv²
= ½ m (gh + v²)
= ½ m (v² + gh)
∴ TEnergy = ½ m (V² + gh)
∴ Total energy at the height (hm) = P.E + KE
The sum of P.E and KE at any point is always constant .
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