Read the Assertion and Reason carefully and select the correct option:
1. Assertion (A): If two objects cover the same distance in the same amount of time, they have the same speed.
Reason (R): Speed is calculated by dividing the total distance covered by the total time taken.
Reason (R): Speed is calculated by dividing the total distance covered by the total time taken.
2. Assertion (A): A common wall clock can measure every time interval smaller than one second accurately.
Reason (R): Modern devices may need to measure very small intervals of time, such as milliseconds or microseconds.
Reason (R): Modern devices may need to measure very small intervals of time, such as milliseconds or microseconds.