physics

I'm having trouble getting the answer for the 2nd and 3rd questions.

# A soccer ball is kicked from the ground. When it reaches a height of 5.93 m, the velocity is v=6.45i+7.46j m/s.
1. Determine the maximum height that the ball reaches. (the right answer is 8.77 m)

2. Determine the total horizontal distance travelled by the ball.


3. What is the speed of the soccer ball just before it hits the ground?


for number 2, i found the total time from yf = yi + viyt - 1/2gt^2
and plugged it into vx=dx/t to get the horiz distance but i still can't
get the right answer
did i miss anything?

  1. 👍 0
  2. 👎 0
  3. 👁 96
asked by rmj
  1. The time the ball is in air is
    2*Vyo/g , where Vyo is the initial vertical velocity component. Solve for that first.

    From energy considerations,
    7.46^2/2 + gH = Voy^2/2
    Voy^2/2 = 86.0 m^2/s^2
    Voy = 13.11 m/s
    so T = 2.67 s

    The distance travelled in that time is
    Vx*T = 17.24 m

    1. 👍 0
    2. 👎 0
    posted by drwls
  2. The way I solved the first part of the question was:
    Vo=?
    d=7.18 m
    Vf = 7.80m/s
    a = 9.81m/s^2
    So find the initial Vo velocity using:
    Vf^2 - Vo^2 = 2ad
    Then once you get Vo, use the same equation to find the d, when Vf = 0, that's when the height is maximal.
    Hope that helps.
    Cheers,
    Ross

    1. 👍 0
    2. 👎 0
    posted by Ross
  3. drwls - could you please explain the reasoning behind this:

    "From energy considerations,
    7.46^2/2 + gH = Voy^2/2
    Voy^2/2 = 86.0 m^2/s^2
    Voy = 13.11 m/s
    so T = 2.67 s

    What does "H" represent? Why can't you just use the total time that the ball is in the air, and multiply that by the initial x-component of velocity? Since d=vt

    1. 👍 0
    2. 👎 0
    posted by emg
  4. the G represents gravity, and H represents the height

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. English

    I have a prompt for an English essay and it says, "In a well developed composition, identify the character, describe what the character questions about society, and explain why the character's questioning is important to the

    asked by Ana on March 8, 2010
  2. Physics

    A soccer player kicks a ball into the air at an angle of 36.0 Degrees above the horizontal. The initial velocity of the ball is +30.0 m/s. 1).How long is the soccer ball in the air 2).What is the horizontal distance traveled by

    asked by Daleda on January 17, 2012
  3. Algebra

    Mutiplying a Binomial by a Trinomial (FOIL) First, Outer, Inner, Last Method (3X+2)(X-1)(X+3) I have tried equation several times. The book says the answer is: 3X 3rd + 8X 2nd - 5X -6 I get: 12X 2nd - 6X + 3X 3rd -4 Not sure if i

    asked by G on April 22, 2008
  4. Math/Standard and scientific notation

    Express each measure in standard form. (One more thing by the way you need this few prefixes) Tera= 10 to the 12th power Giga= 10 to the 9th power Mega= 10 to the 6th power Kilo= 10 to the 3rd power Pico= 10 to the -12th power

    asked by Sandy on February 25, 2009
  5. Physics

    A 400g soccer ball is moving through the air at 3.57m/s [64.8°W of N] horizontally at the top of its flight. If at that instant, the soccer ball is struck by a 450g crocket ball moving at 5.46m/s [N], and the soccer ball flies

    asked by Guillaume on January 11, 2017
  6. Algebra

    I am having trouble with finding the 1st and 3rd quartiles of a set of data. For example, let's say the data is: 4, 9, 11, 16, and 24

    asked by Anonymous on April 3, 2008
  7. 11 Grade College Prep Math-Based Physics

    Not good at physics, so could someone check these practice test questions please? Explanations are appreciated. 1. Which of Newton's Laws says you cannot touch anything without being touched? a) 4th b) 2nd c) 1st d) 3rd *** 2. A

    asked by Ana on October 27, 2015
  8. conditional sentence

    1. If the sound system hadn't failed,last night's show would have been better a. this is a correct sentence using the 1st conditional form b. this is correct sentence using the 2nd conditional form C. this is a correct sentence

    asked by Jim Collum on June 12, 2013
  9. math-probability

    Bob buys three tickets in a raffle in which 500 tickets are sold. What is the probability of him winning" a) 1st prize b) 1st and 3rd prize c) 2nd and 3rd prize Helping me with either a, b, or c should help me answer the other

    asked by Anonymous on June 9, 2017
  10. physical science

    A soccer player applies a force of 51.5 N to a soccer ball while kicking it. If the ball has a mass of 0.46 kg, what is the acceleration of the soccer ball?

    asked by Tityana on March 29, 2012

More Similar Questions