Projectile Height Calculation: Baseball Thrown at 30 Degrees

[bionut]

Homework Statement

A baseball is thrown with an initial velocity of 20 ms at an angle of 30 degrees with the horizontal. How high did it go if it was released and caught 2 meters from the ground?

Homework Equations

The Attempt at a Solution

0=Vi^2 + 2ad
0=(20Sin30)2 + 2 X (-9.8)d
19.62d=100
d=100/19.62
d=5.0m, but this is wrong... Would I mabey need to add 2m to my answer beacuse it is projected from a 2m height? therefore it will go 7m??

 

[PeterO]

Homework Statement

A baseball is thrown with an initial velocity of 20 ms at an angle of 30 degrees with the horizontal. How high did it go if it was released and caught 2 meters from the ground?

Homework Equations

The Attempt at a Solution

0=Vi^2 + 2ad
0=(20Sin30)2 + 2 X (-9.8)d
19.62d=100
d=100/19.62
d=5.0m, but this is wrong... Would I mabey need to add 2m to my answer beacuse it is projected from a 2m height? therefore it will go 7m??

Adding the 2 would be a very good idea , yes

EDIT: you did round off quite a bit to get 5.0m too. That is the answer you get if you take g = 10

 

[bionut]

I know... I got 5.10m, whihc would give 7.1m... I think my teacher sometimes uses 10 or 9.81 depends what kind of day it is ;-), lol