a ball is dropped from rest at a height of 89m above the ground. (a)what is it's speed just before it hits the ground? (b) how long does it take to reach the ground?​

(a) 41.75m/s

(b) 4.26s

Explanation:

Let:

 Distance, D = 89m

 Gravity, = 9.8 m/

Initial Velocity, = 0m/s

Final Velocity, = ?

Time Taken, = ?

With the distance formula, which is

D = +

and by substituting what we already know, we have:

89 = ×9.8×

With the equation above, we can solve for :

Now that we have solved , we can use the following velocity formula to solve for :

, where is also equals to , so we have

By substituting , , and ,

We have:

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