An automated monorail shuttle, fitted with a safety projection barrier, moves at a constant speed along its guide rail. The shuttle passes through two stationary optical sensors connected to a monitoring computer.
The length of the safety projection barrier is 15.6 cm. The barrier takes 240 ms to completely pass through the first optical sensor.
State the relationship between average speed, distance, and time.
Calculate the average speed of the safety barrier as it passes through the first optical sensor. Give your answer in cm/s\text{cm/s}cm/s.
State the time taken for the safety barrier to pass through the second optical sensor.