Question

If a ball is thrown in the air with a velocity 50 ft/s, its height in feet t seconds later is given by y = 50t - 16t2. (Round your answers to one decimal place.)

Estimate the instantaneous velocity when t = 2. in ft/s

Answer 1

so take the derivative and equate t with 2

Answer 2

the inst. vel. is the derivative at the given point