a force of 12N acts for 5 s on a mass of 2 kg. What is the change in momentum of a mass of 10kg under the same condition

The change in momentum is: 60 N.s

Step-by-step explanation:

By Newton's second law:

F = ∆p / ∆t

Given that

∆t = 5sF = 12N

Using the formula to determine the change in momentum

F = ∆p / ∆t

∆p = F × ∆t

     = 12 × 5

      = 60 N.s

Therefore, the change in momentum is: 60 N.s

Inverses are easy for this problem. First we start with the equation. Then we change the f(x) to y to make this whole problem easier. 
y=2x+1
Isolate the x and solve for x. 
x=(y-1/2)
Switch x and y again. 
y=(x-1/2)
Add function notation.
f^-1(x)=(x-1/2)
Done! And if you need to check if equations are inverses, add the original equation into the x variable of the inverse. The solution should be f^-1(x)=x. That means the inverse is right.