A rocket accelerates from rest at a rate of 76 m/s2. (a) What is its speed after it accelerates for 53 s? m/s (b) How long does it take for the rocket to reach a speed of 7,300 m/s? 96.0526 SInitially stationary, a train has a constant acceleration of 0.4 m/s2. (a) What is its speed after 23 s? :1 m (b) What is the total time required for the train to reach a speed of 27 m/s? [:15