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Q.

An object is thrown horizontally from a point A, the ball hits the ground at a point B. The line of sight from A and B makes 60o with the horizontal. If g = 10ms-2, the velocity of projection, if the time of flight is 3 sec. is

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a

10 ms-1

b

5 ms-1

c

10/3 ms-1

d

103 ms-1

answer is B.

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Detailed Solution

Question Image

|v→|=25m/s
Also T=2Hg
H=15cm
R=153m
u=15 m/s

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An object is thrown horizontally from a point A, the ball hits the ground at a point B. The line of sight from A and B makes 60o with the horizontal. If g = 10ms-2, the velocity of projection, if the time of flight is 3 sec. is