how much work could a child do while pulling a 12 kg wagon a distance of 4.3 m with a 22 n force? ?

Loose glasses hinge is a common problem. First, it's good to check if the screws on the hinge are tight enough. If that doesn't work, try using a small drop of glue.
If you find that your glasses are coming off your face too easily, it could be a sign that your glasses' hinges are loose or broken. If this is the case, we would recommend that you visit your optician's or optometrist's for a check-up.
You can have as many Google Voice numbers on one phone as you want as long as the phone is capable of running Google Voice, Android, and the Google Voice app. If you want to have multiple phones with multiple Google Voice numbers on them, then you have to run the Google Voice app on each phone.
You can have multiple Google Voice numbers on one phone but you have to port the numbers from the Google Voice app to the phone's native dialer. You can do this by using Google Voice's web app. Once you have multiple Google Voice numbers on one phone, you won't be able to access them from the Google Voice app.