BWR's latest activity

I surely want an inertial frame (the ground is good enough). Why did you tell me that?

Thank you. Once I estimated the time, how do I calculate the acceleration along the z-axis? should I use ##F = \Delta p / \Delta t##...

Yes, as allready explained by others. The bullet would still be moving (together with the target), so it would still have some kinetic...

No, but I found something in the web. Unfortunately I have no idea for its value, but probably I don't need it. Suppose I fire a...

Yes, use momentum, but that is only one equation and you need two. Are you familiar with coefficient of restitution? That is a property...

You mean the conservation laws give different results. Conservation of momentum is a purely dynamical relation. Conservation of energy...

I suppose that the bullet gets stuck in the target and it transfer all its K to the target; is that a contradiction? From my mind. :smile:

Because you are specifying an impossible combination of conditions. In an actual one dimensional collision, there are two unknowns, the...

I'd say that answers my question. Thank you. Does that mean that I should use momentum to get a reasonable result?

My English is not good, but here I'm trying to understand 2 things. 1) If ##\frac{1}{2}m_bv_b^2 = \frac{1}{2}m_tv_t^2## and ##m_bv_b =...

A bullet hits a target. Assume that all the energy is transferred to the target without destroying it. I want to know the target’s...