Will the value of magnification of a rear view mirror used in a car is positive or negative why?

Write the project non balance force​

Aballoon is ascending vertically with an acceleration of 0.2 metre per second . two stone are dropped at t = 0 and at t = 2 second . find the distance between them 1.5 sec after the second stone is released. answer if you know properly​

Break pads of your bicycle need to be replaced quite often ? give reason urgently​