A small solid sphere falls freely from rest in air with acceleration of 10m/s squared how far does it fall in 5.0s?​

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

From 0 to 5 seconds john pushed a box 5 meters. from 5 to 10 seconds, paul pushed the same box another 5 meters. who did more work? a. john b. paul c. john and paul did the same amount of work.

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?