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
36 m/s
18 m/s

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Physics
Rainbow is due to

diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
ionisation of water deposits

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