Physics
Grade-10
Easy
Question
Two masses m and 2m are dropped from a certain height ‘h’. Then on reaching the ground,
- K.E. of them will be equal
- K.E. of the heavier is 4 times the K.E. of the lighter
- K.E. of the lighter is 4 times the K.E. of the heavier
- K.E. of the heavier is more than that of, the lighter
Hint:
Kinetic energy is directly proportional to the mass of the object.
The correct answer is: K.E. of the heavier is more than that of, the lighter
Two masses m and 2m are dropped from a certain height ‘h’. Then on reaching the ground, K.E. of the heavier is more than that of, the lighter.
- The kinetic energy is directly proportional to the mass of the object.
- Thus, more the mass of the object, more will be its kinetic energy.
- Body with mass 2m will have a greater kinetic energy, because it has greater mass, and hence greater potential energy.
- This potential energy gets converted to kinetic energy as the mass drops down.
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