Online site for free questions and answers?

Question

i'm gonna do cambridge a levels next year. does anyone know a good site where i can get some physics questions and answers for free. a site specially made to the london a level syllabus would be best, but anything else would be ok

thank you

Answer 1

a ball X is thrown directly upwards and it takes 4.0 sec to return to the thrower.a second ball Y is thrown directly upwards 1.0 sec after X is thrown at the same initial speed as X.

at the instant X return to the thrower, what is the height and the velocity of Y????