A stone is dropped off a cliff and it falls for 4.8 m/s

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Which of the following are appropriate acceleration units?