You are a traffic accident investigator. You have arrived at the scene of an accident. Two trucks of equal mass (3,000 kg each) were involved in a rear-end accident at a stop sign. Here is what you know:

• Truck 1 started from rest at the top of a 22-meter hill and coasted toward the intersection.
• Truck 2 was on a flat stretch of road at the bottom of the hill directly in front of Truck 1.
• At the bottom of the hill, Truck 1 was going 20 m/s; Truck 2 was going 35 m/s.
• There were no skid marks left by Truck 2. The collision occurred at the stop sign where Truck 2 had stopped.
• After the collision, both trucks moved together in the same direction at 10 m/s before slowly rolling to a stop.

If Truck 2 came to a stop in 15 seconds, how much power (in watts) did it take to stop Truck 2 at the stop sign by applying force to the brakes?