Final answer:
The initial velocity of a bus that has been accelerating can be determined using the kinematic equation v_f = v_i + at, where v_f is the final velocity, a is acceleration, and t is the time period.
Step-by-step explanation:
The student is asking how to find the initial velocity of a bus that accelerates over a certain period. The given data seems a bit confusing due to potential typos, but the concept needed to answer such a question typically involves the kinematic equations of motion in physics. For the problem provided in the example, where a bus accelerates at a rate of 2 m/s² to reach a speed of 20 m/s, the initial velocity is implied to be 0 m/s if it starts from rest. In a general case, the initial velocity (v_i) can be calculated using the formula v_f = v_i + at, where v_f is the final velocity, a is acceleration, and t is the time period of acceleration.