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  1. C

    A question in knematics

    My suggestion: First take second derivative of x with respect to t to get acceleration which we will call z. Then use dz/dx = (dz/dt)/(dx/dt) Looks messy, but technically correct. In the final result, substitute for x where it appears.
  2. C

    First derivative problem

    If you know calculus, then the first derivative of distance is velocity, and the second derivative is acceleration.