A scooter accelerates from rest for time t1 at constant rate a1 and then retards at constant rate a2 for time t2 and comes to rest. The correct value of \(\frac{{{t_1}}}{{{t_2}}}\) will be:
1
\(\frac{{{a_1}}}{{{a_2}}}\)
2
\(\frac{{{a_2}}}{{{a_1}}}\)
3
\(\frac{{{a_1+a_2}}}{{{a_1}}}\)
4
\(\frac{{{a_1+a_2}}}{{{a_2}}}\)