For the given curve, if α = acceleration in kmphps and β = retardation in kmphps, then β =
1
\(\rm \frac{V_m}{t_2}\)
2
\(\rm \frac{V_m}{t_3}\)
3
\(\rm \frac{V_m}{t_1}\)
4
\(\rm \frac{V_m}{t_1+t_2}\)
For the given curve, if α = acceleration in kmphps and β = retardation in kmphps, then β =