A second particle, R, moves along the x-axis so that its position at any time r is given by a differentiable function iplo) wherel)-4x(3) -8. Explain why there must be a time t, for l which the velocity of particle R is 2 3, at At time , # 3-the velocity of particle R described in part (c) is-2. Are particles Q and R moving tow each other or away from each other at time (d) 3 Explain your reasoning
