physics
posted by Shazz .
A man fires a rock of a slingshot directly upward.The rock has an initial velocity of 15m/s.How long will it take for the rock to return to the level he fired it at?

physics 
Oniccah
Use the third formulae of calculating the displacement.ur initial velocity is 15m/s ,ur final velocity is 0m/s,ur displacement is 0m .substitute this values and solve time
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