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17 July, 21:37

A basketball player jumped straight up to grab a rebound. If she was in the air for 0.80 second, how high did she jump?

A) 3.1 m

B) 0.78 m

C) 1.2 m

D) 0.50 m

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Answers (2)
  1. 17 July, 21:38
    0
    After 0.40 seconds, she must have reached her max height

    she spends half the time going up and the other half falling down

    t = 0.40

    vf = 0

    a = - 9.8

    y = vf t - 1/2 a t^2

    y = 0 - 1/2 (-9.8) (0.4) ^2

    y = 4.9 (0.4) ^2

    Y=0.784

    This will be your answer.
  2. 17 July, 21:55
    0
    - - She went up for 0.4 sec and down for 0.4 sec.

    - - The vertical distance traveled in gravity during ' t ' seconds is

    D = (1/2) x (g) x (t) ²

    = (1/2) (9.8 m/s²) (0.4 sec) ²

    = (4.9 m/s²) x (0.16 s²)

    = 0.784 meter (B)
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