A rocket-driven sled running on a straight, level track has been used to study the physio- logical eﬀects of large accelerations on astro- nauts. One such sled can attain a speed of 395 m/s in 1.6 s starting from rest. What is the acceleration of the sled, assum- ing it is constant? We are starting the chapter tomorrow and I'm not quite sure how to get the final answer. Anyone? Thank you.