Two markers $M_1$ and $M_2$ are set up a vertical distance h apart. When a steel ball is released from rest from a point a distance x above $M_1$, it is found that the ball takes time t to reach $M_1$ and time $t_2$ to reach $M_2$.
Which expression gives the acceleration of the ball?

1 )
$\frac{2h}{{t_2}^2}$
2 )
$\frac{2h}{(t_2+t_1)}$
3 )
$\frac{2h}{(t_2-t_1)^2}$
$\frac{2h}{({t_2}^2+{t_1}^2)}$
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