Consider the coordinate system in the diagram bellow; the z axis points out of the page. At the point (-d, 0, 0) a ball of mass m is initially  (at t= 0) at rest, but it is dropped under the face of gravity, near the Earth.  We ignore air resistance as usual, and treat ball as a point mass.  1.a) What is the position of the ball at time t > 0? 1.b) What is the velocity of the ball at time t > 0?

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