Respostas

2014-01-23T19:09:12-02:00
Fr= m(total) * a
100= 10 * a
a= 10 m/s²

fr - Fab/a= m(b) * a
100- Fb/a = 8 * 10
- Fb/a = 80 - 100
Fb/a= 20 N