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Truck 2, because it has a larger mass than truck 1 (and the same velocity)

Explanation:

We can write the kinetic energy of an object with mass M and velocity V as:

K = (M/2)*V^2

Let's calculate the kinetic energy for each truck:

Now, we can see that both trucks move at the same velocity, but truck 1 has a mass of 5000 pounds, while truck 2 has also a mass of 5000 pounds and an extra of 900 pounds.

Then the total mass of truck 2 is 5000 pounds + 900 pounds = 5900 pounds.

Then both trucks have the same velocity, and truck 2 has a larger mass than truck 1, this implies that truck 2 will have a larger kinetic energy than truck 1.