A person throws a baseball from height of 7 feet with an initial vertical velocity of 50 feet per second. Use the vertical motion model, h =

Question

A person throws a baseball from height of 7 feet with an initial vertical velocity of 50 feet per second. Use the vertical motion model, h = -16t2 + vt +s, where y is the initial velocity in feet per second and s is the height in feet, to calculate the amount of time the baseball is in the air before it hits the ground. Round your answer to the nearest tenth if necessary Time in air: _______ seconds​

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Ngọc Diệp 5 years 2021-07-26T03:11:10+00:00 2 Answers 70 views 0

Answers ( )

  1. Calantha
    0
    2021-07-26T03:12:24+00:00
    Reply

    Answer:

    3.3

    Explanation:

  2. thanhha
    0
    2021-07-26T03:13:07+00:00
    Reply

    Answer:

    3.25 seconds

    Explanation:

    It is given that,

    A person throws a baseball from height of 7 feet with an initial vertical velocity of 50 feet per second. The equation for his motion is as follows :

    h=-16t^2+vt+s

    Where

    s is the height in feet

    For the given condition, the equation becomes:

    h=-16t^2+50t+7

    When it hits the ground, h = 0

    i.e.

    -16t^2+50t+7=0

    It is a quadratic equation, we find the value of t,

    t = 3.25 seconds and t = -0.134 s

    Neglecting negative value

    Hence, for 3.25 seconds the baseball is in the air before it hits the ground.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )