Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

Both the spheres will reach the ground simultaneously.
The question is incomplete because the masses of the spheres are not given.
A will reach the ground first.
B will reach the ground first.

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Physics
A dynamo is a device which

Creates electrical energy
Converts electrical energy into mechanical energy
Converts mechanical energy into electrical energy
Creates mechanical energy

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