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A ball is shot vertically upwards at 10m/s from a height of 5m above the ground, If friction can be ignored, what is the speed of the ball immediately before it strikes the ground?

I need to know if the formula I am using is correct:

Vf= Vi+g.T

would g (9.8m/s2) be -9.8m/s2 for this question because it uses deceleration?

thanks alot!