We have that the the rock's initial launch speed is mathematically given as
From the question we are told
- A rock is thrown horizontally from a tower 4.9 m above the ground,
- and the rock strikes the ground after travelling 20 m horizontally.
- What was the rock's initial launch speed (in m/s)?
Speed
Generally the equation for the Motion is mathematically given as
[tex]H=ut+0.5gt^2\\\\Therefore\\\\4.9=0*t+0.5*9.8*t^2\\\\t=1s\\\\Therefore\\\\sx=uxt\\\\20=ux*1\\\\[/tex]
For more information on speed visit
https://brainly.com/question/7359669
