Applied Mechanics and Graphic Statics
Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30° and 45° respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is

350 m
375 m
425 m
400 m

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Applied Mechanics and Graphic Statics
The following statement is one of the laws of Dynamic friction

All of these
For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed
The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction
The force of friction always acts in a direction opposite to that in which a body is moving

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Applied Mechanics and Graphic Statics
The maximum displacement of a particle executing S.H.M. corresponds to

Zero potential energy and maximum kinetic energy
Maximum kinetic energy and maximum potential energy
Minimum kinetic energy and minimum potential energy
Zero kinetic energy and maximum potential energy

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