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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 60^o with the horizontal. If g = 10ms^-2, the velocity of projection, if the time of flight is $\sqrt{3}$ sec. is

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a

10 ms^-1

b

5 ms^-1

c

10/ $\sqrt{3}$ ms^-1

d

10 $\sqrt{3}$ ms^-1

answer is B.

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Detailed Solution

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$| \vec{v} | = 25 m / s$
Also $T = \sqrt{\frac{2 H}{g}}$
H=15cm
$R = \frac{15}{\sqrt{3}} m$
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