It would be D. Equal to zero
Answer:
90 degree hope it help :))
At condition 1:
I = mL^2
At condition 2:
I’ = m(2L)^2 = 4mL^2 = 4I
Answer:
sin 30° = 
Multiply each side by 25 to cancel the 25 under 
(25)· sin 30° = 
Multiply everything on the left side.
12.5
= vertical velocity component.
I attached a picture, I hope it helps.