I have no idea how to solve this problem, if somone would helpme it will be grea

Question

I have no idea how to solve this problem, if somone would helpme it will be greatly apprecisted!    A student drops a ball from the top of atall buildomg: that ball takes 2.8 s to reach the ground. A) what is the ball's speed just before hitting theground? B) What is the height of the building? Thank you! I have no idea how to solve this problem, if somone would helpme it will be greatly apprecisted!    A student drops a ball from the top of atall buildomg: that ball takes 2.8 s to reach the ground. A) what is the ball's speed just before hitting theground? B) What is the height of the building? Thank you!

Explanation / Answer

A) (2.8s)(9.8m/s^2)=27.44m/s=speed a.k.a. velocity B)y-y0=vt-1/2at^2     y-y0=(0m/s)(2.8s)-1/2(9.8m/s^2)(2.8s)^2     y-y0=0m-38.416m

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