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A gun that is spring-loaded 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 -

    d=1/2 g t^2
    timeinair= sqrt 2d/g=sqrt.10/9.8=.1sec

    horizontal distance=vmuzzle*timeinair

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