1.

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?

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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