Question
Martina hits volley ball with an upward velosity of 13
M/s 1meterabove the grund. How long will it take for the ball to hit the ground.
M/s 1meterabove the grund. How long will it take for the ball to hit the ground.
Answers
Damon
Vi = 13 m/s
Hi = 1.0 m
h = Hi + Vi t - 4.9 t^2
0 = 1 + 13 t - 4.9 t^2
now it is algebra
4.9 t^2 - 13 t - 1 = 0
t = [ 13 +/- sqrt (169 + 19.6)/9.81
use positive time :)
t = 2.73 seconds
(good hit, wow ! )
Hi = 1.0 m
h = Hi + Vi t - 4.9 t^2
0 = 1 + 13 t - 4.9 t^2
now it is algebra
4.9 t^2 - 13 t - 1 = 0
t = [ 13 +/- sqrt (169 + 19.6)/9.81
use positive time :)
t = 2.73 seconds
(good hit, wow ! )