The distance, in feet, a stone drops intseconds is given byd(t)=16t^2

The depth of a hole is to be approximated by dropping a rock and listening for it to hit the bottom. Assume that time measurement is accurate to 1 / 10thof a second. Use a linear approximation to estimate an upper bound for the propagated error if the measured time is: a) 4 seconds

b) 9 seconds.