Question

A golf ball is hit from the ground with an initial speed of 192 feet per second. Assume the starting height of the ball is 0 feet. How long will it take the golf ball to hit the ground? (1 point)
39 secs
19 secs
12 secs
6 secs

Answer 1

use the motion equations of constant acceleration
s = ut + 0.5at^2
displacement s = 0, a = -32ft/sec^2 and u = 192 ft/s

0 = 192t - 16t^2

solving for t will give the answer

Answer 2

can you do this?

Answer 3

I can try :p

Answer 4

on root wil be zero which we can ignore

Answer 5

no

Answer 6

im still confused how you solve for t

Answer 7

ok first factor
0 = t(192 - 16t)
either t = 0 or 192 - 16t = 0
16t = 192
t = 192 / 16 = 12

12 seconds

Answer 8

oh ok thanks!

Answer 9

your welcome