### What is the stopping distance while the surface is dry

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Q1. A car is travelling at 46.0 km/h on a flat highway.

If the coefficient of friction between road and tires on a rainy day is 0.10, what is the minimum distance in which car will stop?

What is the stopping distance while the surface is dry and the coefficient of friction is 0.600?

Q2. A playground is on the flat roof of a city school, 5 m above the street below (see figure). The vertical wall of the building is h = 6.20m high, to form a 1.20 m high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of θ = 53.0° above the horizontal at a point d = 24.0m from the base of the building wall. The ball takes 2.20s to reach a point vertically above wall.

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