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An object thrown vertically upward reaches a height of 320m. What was it's initial velocity? How long will the object take to come back to the earth? Assume g=10m/s^2
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Answer 1

Let the initial velocity = u

final velocity = v

v= 0 m/s

s = 500 m  

2gs = v^2 −u^2

 2 (-10) 500 = u^2

 u = 100 m/s

v = u + at

0 = 100 - 10 t

t = 10 s

total time taken = 20 sec.