LucimaMernsard LucimaMernsard

30-11-2016
Physics

contestada

An object is dropped from a 400-ft tower.

a) when does it hit the ground?

b) how fast is it going at the time of impact?

Respuesta :

andriansp andriansp

05-12-2016

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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