Engineering Mechanics
When two elastic bodies collide with each other,

The two bodies will momentarily come to rest after collision
The two bodies begin to regain their original shape
All of these
The two bodies tend to compress and deform at the surface of contact

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Engineering Mechanics
Which of the following statement is incorrect?

A force acting in the opposite direction to the motion of the body is called force of friction
A machine whose efficiency is 100% is known as an ideal machine
The ratio of the limiting friction to the normal reaction is called coefficient of friction
The velocity ratio of a machine is the ratio of load lifted to the effort applied

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