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Only knowing the time, find the velcotiy at liftoff.

the time is 7 seconds, and i understand that at the maximun height the time is 3.5 seconds. I dont know which equation to use becuase i am not familar with knowing only one variable.

we have 4 equations to choos from.

D = v*t

Vf = Vi + a*t

D = Vi*t + 1/2 a * t

Vf squared = Vi squared +2*a*d

Can you help me ?