Acceleration and Velocity problem

[acisne]

A brick is dropped from a skyscraper. Its function is s(t)= 100t^2+1600
a) How long in seconds does it take the brick to hit the ground?
b) What is the brick's velocity when it strikes the ground (on impact)?

THANKS omg i have to make sure these answers are correct for a math test I'm studying for.

 

[Quaid]

A brick is dropped from a skyscraper.

Its function is s(t)= 100t^2 + 1600

a) How long in seconds does it take the brick to hit the ground?

b) What is the brick's velocity when it strikes the ground (on impact)?

Hello. Do you already understand the meaning of the variable s(t)?

Please double-check the value highlighted in red above; it looks like a typographical error.

Hint: the brick hits the ground when its height above the ground is zero.

Have you calculated the velocity function, yet?

Hint: it's the derivative of function s.

It's not clear from your post what you've done so far -- or where you're stuck -- in this exercise.

Please check out this summary page of the forum guidelines. Thanks