Posted by Anonymous on Monday, February 25, 2013 at 11:32pm.
When the speed has doubled, the vertical component of speed will be
sqrt[(9.6)^2 - (4.8)^2] = 8.31 m/s
(The horizontal velocity component will remain 4.8 m/s.)
The time needed to attain that vertical velocity component is
t = (8.31 m/s)/g = 0.848 seconds
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