Final answer:
Using the acceleration formula, the car was initially moving at a velocity of 4 m/s before it accelerated to 50 m/s in 10 seconds.
Step-by-step explanation:
In 10 seconds, a car accelerates from 4 m/s to 50 m/s. To find the initial velocity of the car before it accelerated, we can use the formula for acceleration, which is acceleration (a) = change in velocity (Δv) / time (t). The change in velocity (Δv) is the final velocity (vf) minus the initial velocity (vi), so the equation can be rewritten as a = (vf - vi) / t.
Plugging the known values into the formula, we have a = (50 m/s - 4 m/s) / 10 s = 46 m/s / 10 s = 4.6 m/s2. The car was initially going at a velocity of 4 m/s before it began to accelerate.