Engineering Mechanics
During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

Greater than
Equal to
Equal and opposite to
Less than

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Engineering Mechanics
According to Newton's first law of motion,

The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
To every action, there is always an equal and opposite reaction
None of these

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