Use the table of data for two falling rocks to answer the questions.

Mass (kg) : rock 1: 2.5. Rock 2: 25.
Height of fall (m) : rock 1: 78.4. Rock 2: 78.4.
Time to fall (s) : rock 1: 4.0. Rock 2: ?

Based on this data, how many seconds will it take rock 2 to fall?

1.6 seconds
40 seconds
4.0 seconds
0.4 second