Acar 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?

width of the flag is given as

speed of the car will be

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

so the time interval will be 0.025 s

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.