Engineering Mechanics
The Cartesian equation of trajectory is (where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

y = (gx²/2u² cos²α) + x. tanα
y = x. tanα + (gx²/2u² cos²α)
y = x. tanα - (gx²/2u² cos²α)
y = (gx²/2u² cos²α) - x. tanα

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Engineering Mechanics
According to Newton's first law of motion,

Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
To every action, there is always an equal and opposite reaction
None of these
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point and their lines of action also lie on the same plane

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