Compute all parts of following problem:
Problem: A stone is thrown from the top of the Bisdorf building upward at an angle of 28.0o to the horizontal with an initial speed of 20.0 m/s. The height from which the stone is thrown is 45.0 m above the ground.
Part A: How long does it take the stone to reach the ground?
Part B: What is the speed of the stone just before it strikes the ground?
Please, try to give explanation what is the speed of the stone just before it strikes the ground. Thanks.