A car starts from rest with an acceleration of 5 ft/s. What is its velocity after it has gone 600 ft?

First, let’s correct the question. Acceleration is the rate of change in velocity. Its unit therefore is ft/sec/sec. If S is the distance traveled for a given duration, S = Vot + (1/2)at^2 where Vo is the initial velocity, a is the acceleration and t is the time. For Vo = 0, a = 6m/sec/sec and t = 3 sec. The distance traveled is S = 0 + (1/2) x 6 x 3^2 = 27 meters

their crystal patterns have been disrupted by stress

we need to know the time interval during which the force acts. impulse of force = momentum change