Physics
A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of

30 m/s
25 m/s
18 m/s
36 m/s

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
Ultraviolet radiations from Sun burn our retina
Infrared radiations from sun burn our retina
All radiations from sun initiate chemical reactions in eyes

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