Answer: Greater than 10 N
Step-by-step explanation:
Given
Gravity force on metal is 10 N
But the metal piece is rising i.e. there must be an upward force greater than 10 N
Suppose the force is F
So, we can write

Any force greater than 10 N is sufficient for the metal to move upwards
The greater the amount of force faster will be the movement
Answer: 2
Steps:
f(-2) = 1/2x^2
f(-2) = 1/2(-2)^2
f(-2) = 1/2(4)
f(-2) = 2
Do 18x18 which equals 324
I didn’t know which problem you specifically needed help with, but I hope this helps.