Nate throws a ball straight up to Kayla, who is standing on a balcony 3.8 m above Nate. When she catches it, the ball is still moving upward

Question

Nate throws a ball straight up to Kayla, who is standing on a balcony 3.8 m above Nate. When she catches it, the ball is still moving upward at a speed of 2.8 m/s. Required:With what initial speed did Nate throw the ball?

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Thành Đạt 6 months 2021-07-25T03:16:07+00:00 1 Answers 124 views 0

Answers ( )

  1. linhdan
    0
    2021-07-25T03:17:59+00:00
    Reply

    Answer:

    9.1m/s  

    Explanation:

    Nate throws a straight ball to Kayla who is standing at a balcony 3.8m above Nate

    When she catches the ball, it is still moving upward with a speed of 2.8m/s

    v = 2.8m/s

    u = ?

    s = 3.8m

    a= -9.8(The acceleration has a negative sign because the speed of the ball is declining)    

    Therefore the initial speed at which Nate threw the ball can be calculated as follows

    v^2= u^2 + 2as

    2.8^2= u^2 + 2(-9.8)(3.8)

    7.84= u^2 + (-74.48)

    7.84= u^2 – 74.48

    u^2= 7.84 + 74.48

    u^2= 82.32

    u= √82.32

    u = 9.1m/s    

    Hence the initial speed at which Nate threw the ball is 9.1m/s

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