Question

An airplane releases a ball as it flies parallel to the ground at a height of...

An airplane releases a ball as it flies parallel to the ground at a height of 135 m as shown in the figure. If the ball lands on the ground exactly 135 m from the release point, calculate the speed v of the plane. Neglect any effects due to air resistance, and use g = 9.81 m/s2 for the acceleration due to gravity.

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Answer #1

Time taken by the ball to rech the ground is

            t = sqrt ( 2 h / g )

               = sqrt ( 2(135m) / ( 9.8 m/s2) )

               = 5.25 s

velocity of the ball is

         v = d / t

            = 135 m / 5.25 s

           = 25.71 m/s

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