Engineering Mechanics
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Upward at its upper end
Perpendicular to the wall at its upper end
Zero at its upper end
Downward at its upper end

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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:

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

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