Free Fall: a Rock Is Dropped from the Top of a Vertical

question 47

Multiple Choice

Free fall: A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff. A second rock is thrown vertically from the cliff, and it takes this rock 2.00 s to reach the ground below the cliff from the time it is released. With what velocity was the second rock thrown, assuming no air resistance?

• A) 4.76 m/s upward
• B) 5.51 m/s downward
• C) 12.3 m/s upward
• D) 4.76 m/s downward
• E) 12.3 m/s downward

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