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Sagot :
[tex]velocity=\frac{distance}{time}=\frac{0,025km}{2,5s}=\frac{25m}{2,5s}=100\frac{m}{s}\\\\
acceleration=\frac{velocity}{time}=\frac{-10\frac{m}{s}}{2,5s}=-4\frac{m}{s^2}\\\\Solution\ is\ D.[/tex]
The average acceleration of Juliette is - 4 m/s².
The given parameters;
- distance traveled by the car, d = 0.025 km = 25 m
- time of motion, t = 2.5 s
The initial velocity of Juliette is calculated as follows;
[tex]u = \frac{d}{t} \\\\u = \frac{25}{2.5} \\\\u = 10 \ m/s[/tex]
The average acceleration of Juliette is calculated as follows;
[tex]a = \frac{\Delta v}{t} \\\\a = \frac{v - u}{t} \\\\when\ she \ stops\ , the \ final \ velocity\ , v = 0\\\\a = \frac{0-10}{2.5} \\\\a = - 4 \ m/s^2[/tex]
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