Question about Velocity, time, height!

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Homework Statement



Q: An object thrown upwards at V0 reaches a maximum height of 100 m.
a. Calculate the initial velocity of V0.
b. Calculate the total flight time.
c. Calculate the height of the object when v=30 m/s.

Homework Equations



That is my question what equations do i need to solve this.

The Attempt at a Solution



Sorry i couldn't attempt because i couldn't find the appropriate equation.
 

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