An aeroplane flying $490$ m above ground level at $100$ m/s, releases a block. How far on ground will it strike.

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Solution

The correct option is B $1$ km
Time taken by block to fall = $\sqrt{2 H / g}$
= $\sqrt{2 \times 490 / 9.8}$
= 10 s
Horizontal distance travelled by block
= Speed × Time
= 100 × 10
= 1000 m
= 1 km

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