Question

A ball is thrown vertically upward from the top of a 100-foot tower, with an initial velocity of 20 ft/sec. Its position function is s(t) = –16t2 + 20t + 100. What is its velocity in ft/sec when t = 1 second?

–12
–44
100
–32

Answer 1

C. 100

Answer 2

how did you get that?

Answer 3

If i plug t=1 into the equation I get 104, which isn't an answer

Answer 4

@zzr0ck3r

Answer 5

@carlyleukhardt

Answer 6

huh?

Answer 7

how did you get that answer? can you please explain?

Answer 8

It was wrong @carlyleukhardt

Answer 9

@graze65 you need to visualize this first with a figure