Yes, I can help you calculate the velocity of a body that starts from rest and undergoes constant acceleration for a given time. In this case, the body has an acceleration of 12 m/s^2 and a time of 5 seconds.
The equation that relates acceleration (a), time (t), and final velocity (v) is:
v = u + a * t
where u represents the initial velocity (which is zero in this case since the body starts from rest).
Plugging in the values, we have:
v = 0 + 12 * 5
v = 60 m/s
Therefore, the velocity of the body after 5 seconds of acceleration is 60 m/s.