To find the acceleration of an object, we need information about its initial and final speeds, as well as the time taken. In this case, we have the initial and final speeds but not the time interval. Without the time, we cannot calculate the acceleration accurately.
Acceleration is defined as the change in velocity divided by the time taken. Since we have the change in speed (40 km/h to 58 km/h), we can determine the acceleration if we know the time interval. Could you please provide the time interval during which the speed changed from 40 km/h to 58 km/h?