The height of an object t seconds after it is dropped from a height of 300 meters is s(t) = −4.9t2 + 300. (a) find the average velocity of the object during the first 6 seconds. -78.4 m/s (b) use the mean value theorem to verify that at some time during the first 6 seconds of fall, the instantaneous velocity equals the average velocity. find that time. 2.1 s