Engineering Mechanics
When two elastic bodies collide with each other,

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

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

None of these
Slant up towards direction of pull
Remain horizontal
Slant down towards direction of pull

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