Question

It is possible to shoot an arrow at a speed as high as 100 m/s. (a) If friction can be ignored, how high would an arrow launched at this speed rise if shot straight up?
(b) How long would the arrow be in the air?

a)
I got
0 = 100m/s + 2(-9.8)(x_f-0)
x_f = 510

b)
0 = 0 + 100m/s(t) + (1/2)(-9.8)t^(2)

I used the quadratic formula and got

-200/-9.8 = 20 seconds

is this correct?

Answer 1

correct. . .