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3)The minimum distance necessary for a car to brake to a stop from a speed of 100.0 km/h is 40 m on a dry pavement. What is the minimum distance necessary for this car to brake to a stop from a speed of 145.0 km/h on dry pavement?
4)A girl is standing at the edge of a cliff 201 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.17 m/s.
a)How long does it take the rock to hit the ground?
b)What is the speed of the rock the instant before it hits the ground?

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