Posted by Malcom on .
A gun that is springloaded shoots an object horizontally. The initial height of the gun is h=5 cm and the object lands 20 cm away. What is the gun's muzzle velocity?
Do i use something like v=sqr(k)/m*x. I am getting something like 3.2m/s, is this somewhat correct at all.
the choices I have are
a. 2.0 m/s
b. 1.0 m/s
c. 3.2 m/s
d. 4.9 m/s
e. 3.9 m/s

Physics 
bobpursley,
d=1/2 g t^2
timeinair= sqrt 2d/g=sqrt.10/9.8=.1sec
horizontal distance=vmuzzle*timeinair
.20/.1=vmuzzle