A ball thrown straight upward returns to its original level in 2.50s. A second ball is thrown at an angle of 36.degrees above the horizontal. What is the initial speed of the second ball if it also returns to its original level in 2.50

Question

anonymous · Answer

i do not understand,when second ball throw at an angle of 36.degrees above the horizontal.
why it return original level?but it is distant x

anonymous · Answer

i also dont understand. The question just says so