Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They can see the objects in darkness
They generate flashes of light
They generate ultrasonic sound waves

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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 ?

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

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