A low-mass ball is descending vertically through air. The graph shows how the resistive force $F_R$ varies with time $t$. At what times is the ball’s speed zero, when is its speed greatest, and when is its acceleration zero?
- Azero speed $t_1$, maximum speed $t_2$, zero acceleration $t_1$
- Bzero speed $t_1$, maximum speed $t_2$, zero acceleration $t_2$
- Czero speed $t_2$, maximum speed $t_1$, zero acceleration $t_1$
- Dzero speed $t_2$, maximum speed $t_1$, zero acceleration $t_2$