# A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown?

##### 2 Answers

#### Explanation:

First of all we get the time of flight from the vertical component:

The horizontal component of velocity is constant so:

see equation [5] and use your calculator :D

#### Explanation:

by setting the positive y-axis pointing upward and the positive x-axis pointing to the right,

[1]

with

[2]

with

where

at where the ball strikes,

we then isolate t,

and insert **t** into (1) at the striking point, assuming that y = 0

[3]

isolating

[4]

[5]

and the value of g depends on what you/your teacher uses ranging from [9,10].