Posted by Anonymous on Friday, February 24, 2012 at 11:45am.
mg = 67 N.
m = 67/g = 67 / 9.8 = 6.84 kg. = Mass of ball.
a = Fap/m = -54.5 / 6.84 = -7.97 m/s^2. = acceleration of ball.
Vf = Vo + at = 0.
t = (Vf-Vo)/a.
t = (0-4.80) / -7.97 = 0.60 s.
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