Engineering Mechanics
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

Both the balls undergo an equal change in momentum
The change in momentum suffered by rubber ball is more than the lead ball
None of these
The change in momentum suffered by rubber ball is less than the lead ball

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Engineering Mechanics
The static friction

Bears a constant ratio to the normal reaction between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move
Is independent of the area of contact, between the two surfaces
All of these

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