A cannon fires a shell with a speed of 84 m/s2 When
the cannon is inclined at 45°, the horizontal distance
covered is observed as 630 m. What is the percentage
decrease in the horizontal distance observed due to
air resistance?
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% decrease= diffrence in range observed and range calculated /range calculated
Range (calculated)= sin2∅/g
∅=45° 2∅=90°
Range= u2/g= 84x84/10= 705.6
%decrease= 705.6-630/705.6 x100= 11% decrease
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