Asked by IGotYa
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? a. 4.0 seconds b. 0.4 second c. 40 seconds d. 1.6 seconds
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Answer: a. 4.0 seconds.
Explanation: In free fall (neglecting air resistance) time depends only on height and g: t = sqrt(2h/g). With h = 78.4 m and g ≈ 9.8 m/s², t = sqrt(2·78.4/9.8) = 4.0 s. Mass does not affect the fall time.
Explanation: In free fall (neglecting air resistance) time depends only on height and g: t = sqrt(2h/g). With h = 78.4 m and g ≈ 9.8 m/s², t = sqrt(2·78.4/9.8) = 4.0 s. Mass does not affect the fall time.
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