A2-kg book is pushed along a table with a force of 4n. find the frictional force on the book if the book's acceleration is 1.5 m/s squared. explain how to find frictional force.

We can use such formula
F=am, where F is resultant force acting on book, a is acceleration and m is mass
Now we can substitute our data.
F=1.5*2
F=3
If we know that on the book is acting 4N and friction force and resultt is 3N we can create such equation
4N-Fr=3N      /-4N
-Fr=3N-4N
-Fr=-1N    /*(-1)
Fr=1N - its the result.

Sublimation- which change of state is shown in model

Im not from america so could you explain what route 70 is? how much km or miles does it have? am i supposed to know ,from this text,what the s(road) is? how many km or miles it has?