Posted by ROBIN on Friday, July 19, 2013 at 5:53pm.
A frustrated office worker throws his laptop out of his business’s highrise
office building. The height, h, in meters of the laptop above the ground at t
seconds can be modelled by 2 h(t) 125 5t .
Estimate the instantaneous rate at which the laptop hits the ground.

MATH  ROBIN, Friday, July 19, 2013 at 5:58pm
sorry the equation is h(t)=125=1255t^2

MATH  Graham, Friday, July 19, 2013 at 7:01pm
h(t) = 125  5t^2
Take the derivative to find the velocity:
v(t) = dh(t)/dt = 10 t
Now:
Find the time when height is 0.
Find the velocity at that time.

MATH  heather, Saturday, July 20, 2013 at 12:09pm
but when h is 0 t=0....

MATH  Henry, Saturday, July 20, 2013 at 7:26pm
h = 1255t^2 = 0
5t^2 + 125 = 0
t^2  25 = 0
(t+5)(t5) = 0
t = 5
t = 5 s.
V = g*t = 9.8 * 5 = 49 m/s.
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