[(0)/(1) Points] Suppose the trajectories of two particles are given by the following vector functions.
r_(1)(t)=(t^(2),15t-56,t^(2)),r_(2)(t)-(17t-72,t^(2),14t-48) for t>=0
Find the values of t at which the particles collide. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
+ ◻