The minimum stopping distance for a car traveling at a speed of 30 m/s is 60 m, including the distance traveled during the drive
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Answer:
The graph is shown below.
The athlete's speed at the finish line is 11 m/s
Total distance covered is 82.5 m.
Explanation:
The graph of speed versus time is drawn below.
Acceleration in the first 5 seconds, m/s²
From the graph, the slope of line OA is the acceleration in the first 5 seconds.
Slope of line OA is given as:
Now, the length AD is nothing but speed at point A or B as AB is a straight line.
Therefore, the speed when crossing the finish line is the speed at B which is equal to 11 m/s.
Distance covered is given by the total area under the graph.
The total area can be divided into two shapes; a triangle and a rectangle.
The area under the graph is the sum of areas of triangle OAD and rectangle ABCD.
Area of triangle OAD is,
Area of rectangle ABCD is,
Therefore, the total distance covered till the finish line is given as:
