Question

What is the instantaneous velocity of the ball at t=2 seconds if a ball is thrown in the air and its height from the ground in meters after t seconds is modeled by `h(t)=-5t2+20t+1`?

Answer 1

`h=21m`.

Explanation:

It is sufficient to substitue `t=2` in that equation:

`h(2)=-5*2^2+20*2+1=21m`.