In a flood hit area relief supplies are dropped in a 20kg bag from a helicopter is flying parallel to the ground at 200km/h and is 80m above the ground when the package is dropped. How much horizontal distance does the bag travel before it hits the ground ? [Assume g = 10ms-2]

Question

Accepted Answer

ক. 29km \frac{2}{9} k m

ব্যাখ্যা: উল্লম্বভাবে পতনকাল $t = \sqrt{\frac{2h}{g}} = \sqrt{\frac{2 	imes 80}{10}} = \sqrt{16} = 4	ext{ s}$।
আনুভূমিক বেগ $v_x = 200	ext{ km/h} = 200 	imes \frac{5}{18}	ext{ m/s} = \frac{500}{9}	ext{ m/s}$।
সুতরাং, অতিক্রান্ত আনুভূমিক দূরত্ব $x = v_x 	imes t = \frac{500}{9} 	imes 4 = \frac{2000}{9}	ext{ m} = \frac{2}{9}	ext{ km}$।

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