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Inelastic collision - An inelastic collision, in contrast to an elastic collision, is a collision in which kinetic energy is not conserved due to the action of internal friction. In collisions of macroscopic bodies, some kinetic energy is turned into vibrational energy of the atoms, causing a heating effect, and the bodies are deformed.
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Change in momentum =Δ
P
=ΔP
x
i
^
+ΔP
x
j
^
, since ΔP
x
=0
=ΔP
y
j
^
=
P
fy
−
P
iy
;
P
iy
=mvsin45
,P
fy
=mvsin45
Δ
P
=−mvsin45
−mvsin45
=−2mvsin45
=−
2
mv
j
=
∣
∣
∣
∣
Δ
P
∣
∣
∣
∣
=
2
mv
e sign shows the direction of change in
momentum in e y-direction.
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