Originally Posted by

**JohnBlaze** A science project studying catapults sent a projectile into the air with an initial velocity of 30 m/s. The formula for distance (s) in meters with respect to time in seconds is

s = -4.9t2 + 30t. [IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG] Find the instantaneous rate of change (and thus the velocity at any time) using the formula I attached. And then find it a t=1

For the first part for finding the instantaneous rate of change I used zero=a but i don't know if that is right. We can't use derivatives because we haven't been taught that yet. And for find t=1 would just plug 1 for t in the original equation.