Final answer:
The velocity of the truck after 8 seconds is 32 m/s.
Step-by-step explanation:
To find the velocity of the truck after 8 seconds, we can use the equation:
final velocity = initial velocity + (acceleration * time)
Since the truck starts from rest, its initial velocity is 0 m/s and the acceleration is 4 m/s². Plugging in these values, we get:
final velocity = 0 + (4 * 8)
final velocity = 32 m/s
Therefore, the velocity of the truck after 8 seconds is 32 m/s.