Motions in Space Homework: Find Table Height, Falling Time

[emk555]

Homework Statement

A bowling ball rolls off a giant's table at a speed of 15 m/s and lands 45 m from the base of the table.

(a) for how many seconds is the ball falling?
(b) how high is the table?

s=15 m/s
d=45 m
v(i)=0
v(f)=15 m/s ?
t=?

Homework Equations

v=d/t
t=d/v
d=vt

The Attempt at a Solution

t=45 m / 15m/s

(a) t=3 s

(b) i honestly have no clue

 

[korican04]

Use
Dy = (1/2)*g*t^2

where g is acceleration due to gravity. Use 9.8m/s^2 or 10m/s^2 depending on what your course uses.