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hachi_roku
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Homework Statement
Heather and Jerry are standing on a bridge 50\;m above a river. Heather throws a rock straight down with a speed of 20\;m/s. Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Ignore air resistance.
How much time elapses between the first splash and the second splash?
4.08 s
Homework Equations
The Attempt at a Solution
i already have the answer of 4.08 s, which according to mastering physics, is correct.
question is: in solving the equations i was instructed to use a positive g for heather and a negative g for jerry...i don't get this.
maybe i did the problem wrong and got the correct answer.