An inclined plane is 3m high. If a kid sits at the top, what will be his potential energy? The mass of the kid is 40 kg.
1 Answer
Solution:
Here, the vertical height of the inclined plane (h) = 3m,
Mass of the kid (m) = 40 kg,
Acceleration due to gravity (g) = 9.8 m/s^2
We know, the potential energy (PE) of an object = mgh
= 40 × 9.8 × 3
= 1176 Joules
Hence, the potential energy of the kid is 1176 J or 1.176 KJ (kilojoules)
Things to remember from Energy
- Energy is the capacity of doing work.
- The SI unit of energy is the joule.
- There are different forms of energy such as mechanical energy, light energy, sound energy, electrical energy, and so on
- Mechanical energy is of two types a) Kinetic energy, and b) Potential energy.
- We get energy in different ways like:
- heat and light energy from the sun
- kinetic energy from wind and running water
- magnetic energy from a magnet, etc
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