Question

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

Mass, Height, and Time to Fall for Two Rocks
Rock 1 Rock 2
Mass (kg) 2.5 25
Height of Fall (m) 78.4 78.4
Time to Fall (s) 4.0 ?
Based on this data, how many seconds will it take rock 2 to fall?

(1 point)
Responses

1.6 seconds
1.6 seconds

4.0 seconds
4.0 seconds

40 seconds
40 seconds

0.4 second

Answer 1

4.0 seconds.

Time to fall from a given height (ignoring air resistance) is independent of mass: t = sqrt(2h/g) = sqrt(2·78.4/9.8) = sqrt(16) = 4.0 s.