Physics
A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

Both reach at the same time
Depends on their masses
Sphere
Disk

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Physics
The bats can fly in the dark because

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

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