A car starts to move at time t = 0. If the engine of the car is able to provide constant power, which of the following statements is correct about the speed of car at the beginning of the motion?
a) The speed is constant.
b) The speed increases proportionally to time passed (v∝t).
c) The speed increases as the square root of time (v∝t).
d) The speed increases as time squared (v∝t2).