Two balls A and B are thrown with same velocity u from top of a tower. Ball A is thrown vertically u

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2.Motion in Straight Line

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Two balls $A$ and $B$ are thrown with same velocity $u$ from the top of a tower. Ball $A$ is thrown vertically upwards and the ball $B$ is thrown vertically downwards. If a ball $C$ is thrown with the same velocity but in the horizontal direction from the top of the tower,If $t_A = 6\ s$ and $t_B = 2\ s$ then it will reach the ground in time $t_c$ equal to........$s$

A

$4$

B

$3.46$

C

$4.2$

D

none of these

Solution

$t_c=\sqrt{t_A\cdot t_B}$

$t_c=\sqrt{6\cdot 2}$

$t_c=3.46$

Standard 11

Physics

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