Answer:
Answers are in the explanation
Step-by-step explanation:
a)
vf² = vi² + 2gh
0 = vi² + 2(-9.8)(72)
vi = 37.57 m/s
b)
vf = vi + gt
0 = 37.57 - (9.8)t
t = 3.83 s
3.83 x 2 = 7.67 s
vf = vi + gt
vf = 37.57 - (9.8)(7.67)
vf = -37.60 m/s
c)
Its vertical velocity at the highest point is 0 m/s