The height s at time t of a silver dollar dropped from the World Trade

[Yyyanngg]

Homework Statement

The height s at time t of a silver dollar dropped from the World Trade center is given by
s=−16t2+1350
where s is measured in feet and t is measured in seconds.
a) Find the average velocity on the interval [1, 2].
b) Find the instantaneous velocity when t=1 and t=2.

Relevant Equations

The height s at time t of a silver dollar dropped from the World Trade center is given by
s=−16t2+1350
where s is measured in feet and t is measured in seconds.

I don't have any solution

 

[Office_Shredder]

Can you write down a function to give the instantaneous velocity?

 

[epenguin]

This is standard stuff found elementary textbooks, or that you can find by googling "Motion under uniform acceleration", that tie together distance travelled, velocity, acceleration and time.

If there is anything special about this, this is the unusual nonmetric units that you will have to be careful about.