Applied Mechanics and Graphic Statics
The resultant of the forces acting on a body will be zero if the body

Moves along a curved path
Does not move at all
Moves with variable velocity in a straight line
Rotates

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Applied Mechanics and Graphic Statics
A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

Vertical component of velocity remains constant
Kinetic energy of the ball remains constant
Speed of the ball remains constant
Horizontal component of velocity remains constant

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