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A bus decreases its speed from 80 \text{ km h}^{-1} to 60 \tex... - Science
Question
A bus decreases its speed from 80 \text{ km h}^{-1} to 60 \text{ km h}^{-1} in 5 \text{ s}. Find the acceleration of the bus.
Answer
Given:
Initial velocity (u) = 80 \text{ km/h} = 80 \times \frac{5}{18} = 22.22 \text{ m/s}
Final velocity (v) = 60 \text{ km/h} = 60 \times \frac{5}{18} = 16.67 \text{ m/s}
Time (t) = 5 \text{ s}
Formula:
a = \frac{v - u}{t}
Calculation:
a = \frac{16.67 - 22.22}{5}a = \frac{-5.55}{5}a = -1.11 \text{ m/s}^2
Answer: The acceleration of the bus is -1.11 \text{ m/s}^2.