Please help!!! You are walking on a bridge and accidentally drop your cell phone. If the bridge is 20.3 m above the water, how long does it

Question

Please help!!! You are walking on a bridge and accidentally drop your cell phone. If the bridge is 20.3 m above the water, how long does it take the phone to hit the water?

A. 3.22 s
B. 4.14 s
C. 2.04 s
D. 1.75 s

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Tryphena 4 years 2021-09-01T15:51:41+00:00 2 Answers 162 views 0

Answers ( )

  1. hongcuc2
    0
    2021-09-01T15:52:53+00:00
    Reply

    Answer: The answer is c

    Explanation: Use the  equations of falling body and consider g=9.8ms inverse two.

  2. Orla
    0
    2021-09-01T15:52:56+00:00
    Reply

    The distance an object falls in ‘ t ‘ seconds is …

    D = (1/2) (gravity) (t²)

    In this question,  

    20.3m = (1/2) (9.8 m/s²) (t²)

    t² = (20.3m) / (4.9 m/s²)

    t² = 4.143 sec²

    t = √(4.143 sec²)

    t = 2.04 second (choice-C)

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