Posted by peter on Wednesday, April 6, 2011 at 10:52pm.
The distance that he has to ski is
D = 30m/sin20 = 87.7 m
The acceleration component down the slope is g sin 20 = 3.35 m/s^2
D = (1/2)*(3.35) t^2 = 87.7 m
t^2 = 52.35 s^2
t = 7.2 seconds
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