Physics
When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?

Energy
Displacement
Velocity
Acceleration

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Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of nucleons
equal number of protons and electrons
the same number of protons but different number of neutrons

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Physics
For an ideal gas, which one of the following statements does not hold true?

The potential energy of the gas molecules is zero
There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same
The speed of all gas molecules is same

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