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प्रश्न
A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
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उत्तर
Kinetic energy of the ball just before hitting the ground =
Initial potential energy= mgh=2 x 10 x 5 = 100 J
संबंधित प्रश्न
Fill in the blank
The energy possessed by a body due to its motion is called ______ energy.
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?
Give one relevant example for the following transformation of energy:
Electrical energy to mechanical energy.
Give one relevant example for the following transformations of energy:
Chemical energy to heat energy.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given cases:
A compressed spring
State the energy changes in the following case while in use:
a ceiling fan
Select the renewable and non-renewable sources of energy from the following:
Coal
Give one example when:
Light energy changes to chemical energy.
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
What is the difference between the solid, liquid, and gaseous states of a substance?
