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# A plane is flying horizontally at an attitude of 490 m with a velocity of 80 m/s. A bomb is dropped from it. After how much time does the bomb reach the ground ?

$(a)\;5s \quad (b)\;2s \quad (c)\;12s \quad (d)\;10s$

$Time\; of\; descent=\sqrt {\large\frac{2h}{g}}$
$\qquad=\sqrt {\large\frac{2 \times 490}{9.8}}$
$\qquad=\sqrt {100}$
$\qquad=10 s$
Hence d is the correct answer.
edited May 23, 2014

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