Question

A car drives carrying a flag of width w=0.5m. when the flag goes through a photogate, it blocks and unblocks a light. if the average speed of the car is 20m/s, what is the photogate time interval in seconds?

Answer 1

width of the flag is given as

`w = 0.5 m`

speed of the car will be

`v = 20 m/s`

now the time to cross the photogate by the flag is given as

`t = (d)/(v)`

`t = (0.5)/(20)`

`t = 0.025 s`

so the time interval will be 0.025 s