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I have a homework question where it asks, "after the spring is compressed and the popgun fired, to what height does the projectile rise from point B? The question is related to an example problem in the book, where the example tells you to solve for "k", which is the spring force constant. By looking at the example i can find out what the equation for the height would be equal to, but i do not know where friction force comes into play. In the previous example it says, neglecting all resistive forces, determine the spring constant and in this example your determining height, but this time there is a resistive force (aka friction force). So, what do i do? Do i just minus the friction force.

equation for the height is

Yc= [MGYa+1/2KX^2]/MG where the lowercase letters are subscripts and Yc is the height that rises above point B.

So, my question is where does friction force go into this equation so that i find the height and so that im not neglecting resistive forces(friction force)??????

LOOK AT OTHER POSTS FOR MORE IN DEPTH PLEASE HELP I NEED TO FIGURE THIS OUT BY TOMORROW

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# Homework Help: Not neglecting friction force

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