A car hits a tree at an estimated speed of 10 mi/hr on a 2% downgrade. If skid marks of 100 ft. are observed on dry pavement (F=0.33) followed by 200 ft. on an unpaved shoulder (F=0.28), what is the initial speed of the vehicle just before the pavement skid was begun?

Explanation:

The deceleration of the car on the dry pavement is found by the Newton's Law:

Where:

Likewise, the deceleration of the car on the unpaved shoulder is:

The speed just before the car entered the unpaved shoulder is:

And, the speed just before the pavement skid was begun is:

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the warning light flashes for a second or two when the engine starts. if it stays on, there's must be something wrong with the coolant. you should never dare to continue driving when the light is on. pull over as soon as possible and shut the engine off.

hope this is what you're talking about