A ball is thrown upward with a speed of 40 m/s. Approximately how much time goes it take the ball to travel from the release location

Question

A ball is thrown upward with a speed of 40 m/s. Approximately how much time goes it take the ball to travel from the release location (A) to its highest point(B)? Approximately how much total time is the ball in the air before it returns to back to its original height (C)?

in progress 0
Latifah 3 years 2021-07-17T12:23:15+00:00 1 Answers 34 views 0

Answers ( )

  1. thugiang
    0
    2021-07-17T12:24:24+00:00
    Reply

    Answer:

    (I). The time at highest point 4.0 sec.

    (II).  It returns to back to its original height in 8.1 sec

    Explanation:

    Given that,

    Velocity v=40\ m/s

    (I). We need to calculate the time at highest point

    Using equation of motion

    v=u+gt

    Where, v = final velocity

    u = initial velocity

    g = acceleration due to gravity

    t = time

    Put the value into the formula

    0=40-9.8t

    -40=-9.8t

    t=\dfrac{40}{9.8}

    t=4.0\ sec

    (II). We know that, when the ball to travel from the initial point and reached at initial point then the displacement is zero.

    We need to calculate the total time when it returns to back to its original height

    Using equation of motion

    s=ut-\dfrac{1}{2}gt^2

    Where, s = displacement

    g = acceleration due to gravity

    t = time

    u = velocity

    Put the value in the equation

    0=40t-\dfrac{1}{2}9.8t^2

    80t-9.8t^2=0

    t=0, 8.1 sec

    Hence. (I). The time at highest point 4.0 sec.

    (II). It returns to back to its original height in 8.1 sec

Leave an answer

Browse

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