Applied Mechanics and Graphic Statics
On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

Towards the wall at its upper end
Away from the wall at its upper end
Downwards at its upper end
Upwards at its upper end

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Applied Mechanics and Graphic Statics
The masses of two balls are in the ratio of 2 : 1 and their respective velocities are in the ratio of 1 : 2 but in opposite direction before impact. If the coefficient of restitution is ½, the velocities of separation of the balls will be equal to

Half the original velocity in the same direction
Half the original velocity in the opposite direction
Original velocity in the same direction
Original velocity in the opposite direction

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