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An object is dropped from a 400-ft tower.

Awhen does it hit the ground?

Bhow fast is it going at the time of impact?

Verified Answer :

we know that k = 400 

vt = -32t ;  dt = 400 - 16t^2

0 = 400 - 16t^2

when it hit the ground

0 = 400 - 16t^2

t = +/- 5s

so , 
a = 5 s
b = 160 ft/s

Hope this helps

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