A train passes an observer standing on a platform. The first carriage of the train passes the observer in time `t_(1) = 1 s` and the second carriage in `t_(2) = 1.5s`. Find its acceleration assuming it to be constant. The length of each carriage is: l = 12 m.

Options

A. `3.3m//s^(2)`
B. `-3.2 m//s^(2)`
C. `24 m//s^(2)`
D. `-24m//s^(2)`

Answer

B