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You throw a stone straight up with speed 9.8 m/s. Exactly 0.80 s later you throw...

You throw a stone straight up with speed 9.8 m/s. Exactly 0.80 s later you throw a second stone straight up with the same initial speed. Ignore the possible influence of air resistance. (a) When do the stones collide? (b) How high above their common starting point are the stones when they collide?

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