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Q.

Two paper screens A and B are separated by a distance of 100 m. A bullet pieces A and then B. The hole in B is 10 cm below the hole in A. If the bullet is travelling horizontally at the time of hitting the screen A. Calculate the velocity $v$ of the bullet when hits the screen A and time taken by the bullet to reach screen B is T. Neglect the resistance of paper and air.

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a

$v = 700 m s^{- 1}$

b

$T = \frac{1}{6} \sec$

c

$T = \frac{1}{7} \sec$

d

$v = 600 m s^{- 1}$

answer is B, D.

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Detailed Solution

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$\begin{array}{l} v_{A} t = 100 \\ s = u t + \frac{1}{2} a t^{2} \\ 0.1 = \frac{1}{2} g t^{2} \\ v = 700 m s^{- 1} \end{array}$

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Two paper screens A and B are separated by a distance of 100 m. A bullet pieces A and then B. The hole in B is 10 cm below the hole in A. If the bullet is travelling horizontally at the time of hitting the screen A. Calculate the velocity v of the bullet when hits the screen A and time taken by the bullet to reach screen B is T. Neglect the resistance of paper and air.