It is rainning vertically downwards. By how many times that a person should increase his velocity in order to change his umbrella position from an angle 30^(@) with vertical to 60^(@) vertical to protect himself from rain.

It is rainning vertically downwards. By how many times that a person s

1.	It is rainning vertically downwards. By how many times that a person should increase his velocity in order to change his umbrella position from an angle 30^(@) with vertical to 60^(@) vertical to protect himself from rain.
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