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

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

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that increases with depth
To withstand pressure that is increased with atmospheric pressure
Because streamlining is required

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Physics
What is the principle of a ''Life Jacket"?

The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat

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