128 = 2^7 = 2*(2^3)^2
sqrt(128) = sqrt(2*(2^3)^2) = 2^3*sqrt(2)
Here's how I answer these kind of questions.
e = 1/2 mv ^2
Times 2 for both sides.
2e = mv^2
And this is because you are trying to find the formula when solved for v.
And I can help you find that formula which is:
mv^2 = 2e
v^2 = 2e/m
v = √(2e/m)
The line on -4 to -1 and both the lines on the right side
