1.

Two objects move toward each other, collide, and separate. If there was not net external force acting on the object, but some kinetic energy was lost, then

Answer»

the COLLISION was ELASTIC and total linear momentum was CONSERVED
the collision was elastic and total linear mometnum was not conserved
the collision was not elastic and total linear momentum was conserved
the collision was not elastic and total linear momentum was not conserved

Solution :Total linear momentum is conserved in a collision during which the NET external force is zero. If kinetic enregy is lost, then by DEFINITION, the collision is not elastic.


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