Models represent objects in the real world compared to real world objects what is generally true about models

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?