If an object is dropped from a tall building and hits the ground 3.0 s later, what is the velocity of the object when it hits the ground? (remember that the velocity is downward)

Using the kinematic equation:

Vf=Vi+at then plug the values in.

Vi=0 m/s (Because the ball is dropped)

t=3 s.

a=9.81 m/s=g

Vf=0+3*9.81;

Vf=29.43 m/s

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