An object travels the first 25 m in 4 s and then the next 15 m in 2 s. What is the average speed of the object?
\(6.67\text{ ms}^{-1}\)
Average speed is the total distance covered divided by the total time taken. It is measured in metres per second and is written with the unit m s-1.
Total distance = 25 + 15 = 40 m and total time = 4 + 2 = 6 s, so average speed = \(\dfrac{40}{6} \approx 6.67\text{ m s}^{-1}\). Options with units s-1, m or the wrong exponent are dimensionally inconsistent with speed.
Hence, \(6.67\text{ ms}^{-1}\).
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Important Questions from Speed and Velocity
Which of the following quantities specifies its speed with direction?
The basic unit of speed of an object is ______.
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- The area under the velocity–time curve between times \(t_1\) and \(t_2\) is equal to the ______ of the object during that interval of time.
