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Solve a Physics Problem

A car traveling at 15.6 meters per second (about 56 km/hr) is 24.0 meters from a barrier when the driver slams on the brakes. The car hits the barrier 2.0 seconds later. What is the car's deceleration when the brakes are on, and how fast is the car moving when it hits the barrier?

Looks like the car's deceleration is in the first box, 3.6 meters per second per second (m/s2), and the speed at which it will hit the barrier is 8.4 meters per second (second box).

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