Question

a body of mass 0.05 kg is observed to fall with constant velocity the opposite force offer on the body is

Answer 1

the opposite force offered by the air on the body is :. here
a=9. 8
And mass=0. 05
so the air resistence offered on its surface is
A×M=9. 8×0. 05
" " =0. 49N

Answer 2

The opposite force offers on the body is = 0.05 ×9.8

                                                                   =0.49 N