Why a truck needs a bigger more powerful engine than a small car to reach the same speed?

A truck requires a bigger, more powerful engine than a small car to reach the same speed primarily due to its greater weight and larger size. This increased mass creates more rolling resistance and requires more force to accelerate. Additionally, trucks often have to overcome more aerodynamic drag because of their bulkier shape, necessitating a stronger engine to maintain speed. Lastly, trucks are designed to carry heavy loads, which further demands a more powerful engine to achieve and sustain comparable speeds to smaller vehicles.