Potassium is placed where it is based on its properties and it's reactivity. It's also placed there based on it's atomic number.
5 hope this helps I’m pretty sure it should be right
Answer: Value of impulse is 
Explanation: lmpulse is defined as the amount of force acting over a short time interval 't' which is equal to the change in momentum of the body having mass 'm'.
Mathematically,

And,

Given:

Putting values in above equation, we get:

