Final answer:
The truck with the greater mass has more kinetic energy than the other truck if they are moving at the same velocity, due to the relationship between mass and kinetic energy.
Step-by-step explanation:
When two trucks have the same velocity but different mass, the truck with the greater mass has more kinetic energy than the other truck. This is because kinetic energy (EK) of an object is directly proportional to both its mass (m) and the square of its velocity (v), as given by the equation EK = 1/2 mv2. Hence, if two trucks are moving at the same speed, the one with the higher mass will possess more kinetic energy. For example, a truck of 2000 kg moving at 100 km/h has more kinetic energy than a car of 500 kg also moving at 100 km/h because of its greater mass.