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March 29, 2017

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Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 22 m/s at an angle 63 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground.

  • Physics - ,

    horizontal speed = u = 22 cos 63 the whole time

    Vi = 22 sin 63

    at top v = 0 = Vi - g t where t is rise time t = Vi/9.81

    average speed up = Vi/2
    so top height = (Vi/2)t + 1.5

    total time in air = 2 t
    so Sarah is u (2t) = 22 coa 63 (2t) meters from Julie

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