Final answer:
To calculate the final velocity of a truck that accelerates at a rate of 0.5 m/s² for 4 seconds from an initial velocity of 30 m/s, the formula v = u + at is used, resulting in a final velocity of 32 m/s.
Step-by-step explanation:
The question involves calculating the final velocity of a truck that is accelerating. To find the final velocity (v), we can use the formula v = u + at, where 'u' is the initial velocity, 'a' is the acceleration, and 't' is the time over which the acceleration occurs.
In this case, the given initial velocity (u) is 30 m/s, the acceleration (a) is 0.5 m/s2, and the time (t) is 4 seconds. Plugging these values into the formula gives us:
v = 30 m/s + (0.5 m/s2 × 4 s) = 30 m/s + 2 m/s2
Therefore, the final velocity (v) is 32 m/s.
Answer: c. 32 m/s