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A cannon fires a shell with a speed of 84m/s. When the cannon is inclined at 45`, the horizontal distance covered is observed as 630m. What is the percentage decrease in the horizontal distance observed due to air resistance? |
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Answer» ge of a projectile in two dimensions in the ABSENCE of any air resistance: HORIZONTAL speed = u COS Ф time of flight = 2 * u sin Ф / g So R = u²/g * Sin 2Ф = 84² / 9.81 * Sin (2 * 45° ) = 719.266 meters. actual range observed = 630 m% DECREASE = 89.266 / 719.266 * 100 = 12.41% |
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