Step 1 :The BMW convertible travels at a speed of 28 km/h.
Step 2 :To convert this speed from kilometers per hour to meters per second, we use the conversion factor 1 km = 1000 m and 1 hour = 3600 seconds. So, we multiply the given speed by 1000 and divide by 3600.
Step 3 :Using this conversion, the speed of the car in meters per second is approximately \(7.78 \, \text{m/s}\).
Step 4 :To convert the speed from kilometers per hour to miles per hour, we use the conversion factor 1 km = 0.621371 miles. So, we multiply the given speed by this factor.
Step 5 :Using this conversion, the speed of the car in miles per hour is approximately \(17.40 \, \text{mph}\).
Step 6 :Final Answer: The speed of the car is approximately \(\boxed{7.78 \, \text{m/s}}\) and \(\boxed{17.40 \, \text{mph}}\).