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Q.

A truck is moving with velocity u. An object is projected from the truck with velocity u making an angle of 60o with horizontal as seen from the truck. What is the angle of projection as seen from ground?

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a

45o

b

60o

c

30o

d

tan-112

answer is C.

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Detailed Solution

If α1 be the angle of projection as seen from the ground, then tan α1=usinαu+ucosα=sinα1+cosα=sin60o1+cos60o=13⇒α1=30o
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