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## Homework Statement

__The height "s" at time of a silver dollar dropped from a building is given by s(t) = -16t^2 + 1350, where "s" is measured in feet and "t" is measured in seconds__

__[s'(t) = -32t]__**( I ALREADY SOLVED)**

a) Find the average velocity on the interval [1,2].

a) Find the average velocity on the interval [1,2].

**b) Find the instantaneous velocity when t=1 and t=2.**(I ALREADY SOLVED)

**c) How long will it take to hit the ground?**

Not sure about this one. Here's what I did: t=sqrt of 1350/16 ≈ 9.2

d) Find the acceleration of this object at any given point in time.

d) Find the acceleration of this object at any given point in time.

Not sure about this one. Here's what I did:

v(t) = s'(t) = -32t.

**(Really have no idea how to find it)**

e) What's the velocity of this object when it hits the ground?

e) What's the velocity of this object when it hits the ground?

Thanks in advance! I really need to learn how to do this type of problem for my upcoming quiz.