Which one
SPEED?
VELOCITY?
ACCELERATION ?...
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The 1st and 3rd Equation of motion are the same, the force is zero. Thus 0 =force = Sum forces = action + reaction =0
In the equation of a periodic motion it could represent the amplitude, frequency or phase.
The answer depends on how the body is moving:in 2-dimensional space or 3-d,in a straight line or notat a constant velocity of notat a constant acceleration or not.For example, the equation for a body moving in simple harmonic motion isd2y/dx2 = -w2*x
Logarithmic equation
Get the value of initial velocity. Get the angle of projection. Break initial velocity into components along x and y axis. Apply the equation of motion .