when a material collides with another material faster than the speed of sound in that material, it tends to splash, because the emu seems to have maintained its shape while the wood was affected, we can surmise the speed was greater than the speed of sound in wood and less than the speed of sound in emus, which I have taken as the speed of sound in bone, as the shape in the wood roughly approximates the skeleton of the bird, this seems like it won’t work, because the SOS is greater in wood than in bone, but if we negate the velocities by turning the emu backwards, then suddenly -2117.8 > -3960.
therefore, we can surmise the emu was slammed backwards into the tree between 2120 m/sand 3960 m/s.
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