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At the edge of a roof a ball is thrown at 12 m/s at +45 degrees....

At the edge of a roof a ball is thrown at 12 m/s at +45 degrees. The second ball is thrown from the same location at 12 m/s at -45 degrees. Both balls strike the ground at the same time. The first ball is thrown at to, a second ball is thrown at t1, and the building is 100 m tall.

a) What is the velocity of the first ball when it strikes the ground?

b) What is the velocity of the second ball when it strikes the ground?

c) What time elapsed between to and t1?

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