Which of these is not a reasonable fitness goal?
a. i want to exercise for 3 hours every day.
b. i want to exercise for 30 minutes, five days a week.
c. i want to be able to do 50 sit-ups in a row by next month.
d. i want to be able to run 1 mile in 12 minutes.

I think A

Explanation:

I'm not sure but all the other ones seem reasonable and exercising 3 hours a day is a bit much I'm not sure it might be D but I cant really say that because I'm a cross country runner and 12 minutes a mile isn't bad

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach