science
posted by Anonymous .
A ball is thrown upward to 80m high, ball will be 2times at 80m during the interval of 6sec, accelaration 10 and find velocity?

science 
Henry
Tf = 6/2 = 3 s. = Fall time from hmax
to 80 m.
V = Vo + gt = 0 + 10*3 = 30 m/s.
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