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CBSE Class 11-science Answered

An aeroplane is flying horizontally with a speed of 40kmph at a height of 45m from the ground . It drops an object . Find the angle at which the object strikes the earth ? 
Asked by arunavamitra50 | 07 Jul, 2018, 04:51: AM
answered-by-expert Expert Answer
 
Horizontal velocity component at ground, ux = 40 km/hr = 40×(5/18) = 100/9 m/s
 
vertical velocity component at ground, uy begin mathsize 12px style equals space square root of 2 cross times g cross times h end root space equals square root of 2 cross times 9.8 cross times 45 end root space equals space 29.7 space m end style
angle of striking the ground  begin mathsize 12px style equals space tan to the power of negative 1 end exponent open parentheses u subscript y over u subscript x close parentheses space equals space tan to the power of negative 1 end exponent open parentheses fraction numerator 29.7 over denominator begin display style bevelled 100 over 9 end style end fraction close parentheses space equals space 69.5 degree end style
Answered by Thiyagarajan K | 07 Jul, 2018, 10:10: AM
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