Someone throws one vertically upwards on the outside of the balcony of a high rise building at a spe

Updated on Balcony 2024-09-30
2 answers
  1. Anonymous users2024-01-24

    Take the vertical upward direction as the positive direction, when the stone moves to the top of the throwing point and is 15m away from the throwing point, the displacement is x=15m, which is changed by x=v0t-12gt

    Substituting yields 15=20t-1

    2 10t solution yields t1=1s, t2=3s

    When the stone moves to 15m below the throwing point and is 15m away from the throwing point, the displacement is x=-15m, which is changed by x=v0t-12gt

    Substituting yields 15=20t-1

    2 10t solution gives t1=(2+

    7）s，t2=（2-

    7) s (to be discarded).

    Therefore, ACD is chosen

  2. Anonymous users2024-01-23

    15=20t-1

    Á10t¬½t1

    1s£¬t2

    15=20t-1

    Á10t¬½t1

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