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If a body is rolling down from a hill at certain height, the body will have
- a)Kinetic Energy only
- b)Rotational energy and Kinetic energy only
- c)Potential energy only
- d)Kinetic energy, Rotational energy and potential energy
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
If a body is rolling down from a hill at certain height, the body will...
CONCEPT:
- When a body moves in a linear direction, it possesses kinetic energy.
- The Kinetic Energy of an object due to its linear speed is given by
E = 1/2 (m × v2)
where m is the mass of a body and v is the speed.
- When a body does the rotational motion, it possesses rotational kinetic energy.
E = 1/2 (I × ω2)
where I is the moment of inertia of the body, and ω is the angular velocity.
- When a body is at a certain height, it has potential energy.
PE = m g h
where m is the mass of a body, g is gravitational acceleration, and h is the height from the earth's surface.
EXPLANATION:
- Kinetic energy: Since the body is moving in a linear direction, so it will have kinetic energy due to its velocity.
- Rotational energy: Along with linear velocity, the body is also revolving i.e. rotating, so it will have rotation energy.
- Potential energy: Since the body is at a certain height, it will have potential energy.
- Hence the body will have all three Kinetic energy, Rotational energy, and potential energy.
- So the correct answer is option 4.
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If a body is rolling down from a hill at certain height, the body will havea)Kinetic Energy onlyb)Rotational energy and Kinetic energy onlyc)Potential energy onlyd)Kinetic energy, Rotational energy and potential energyCorrect answer is option 'D'. Can you explain this answer?
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