Question

How do you find a rate of change

Answer 1

i think, for anything to do with force you have to assume an even amount of force is spread out evenly.

Answer 2

For what kind of rate? Speed, growing, projectile?

For anything to do with force you have to assume an even amount of force is spread out evenly. But for things like growing rate you have all those variables so you can't assume a constant growing rate like acceleration.

Hope this helps!