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

Downwards at its upper end
Perpendicular to the wall at its upper end
Upwards at its upper end
Zero at its upper end

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Applied Mechanics and Graphic Statics
Free body diagram is an

None of these
Isolated joint with only body forces acting on it
Isolated joint with all the forces, internal as well as external, acting on it
Isolated joint with internal forces acting on it

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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

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

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