Answered

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A object of mass m is at rest when it is
suddenly struck head-on by another
object with a mass 4m moving at speed
v. After the collision, the object of mass
m has a speed of 8/5 v. If the collision is
perfectly elastic, what speed will the
second object have after the collision?
zero
2v/3
3v/5
5v/3

Sagot :

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