If a stone is thrown down at120 ft/secfrom a height of 1000feet, its heights

aftertseconds is given by

s(t)=1000120t16t^2, withs in feet.

Computes(t), and hence find the stone's velocity at timest=0,1,2,3, and4 seconds.

s(t)=

s(0)=

s(1)=

s(2)=

s(3)=

When does the stone reach the ground, and how fast is it traveling when it hits the ground? (Hint:It reaches the ground when the height is zero, in other words, whens(t)=0.)

The stone hits the ground after____seconds.

The stone is traveling at____-ft/sec when it hits the ground.