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Math Help - Please help me with these physics/math problems. (desperate)

  1. #1
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    Please help me with these physics/math problems. (desperate)

    1.
    A tennis ball with a velocity of 10.9 m/s to
    the right is thrown perpendicularly at a wall.
    After striking the wall, the ball rebounds in
    the opposite direction with a velocity of −9.87
    m/s to the left.
    If the ball is in contact with the wall for
    0.011 s, what is the average acceleration of
    the ball while it is in contact with the wall?
    Answer in units of m/s
    2
    You and a friend each drive 44 km to the
    same destination. You travel at 89.2 km/h
    and your friend at 95.9 km/h.
    How long will your friend wait for you at
    the end of the trip?
    Answer in units of min
    3.
    The average speed of an orbiting space shuttle
    is 21100 mi/h. The shuttle is orbiting about
    248 mi above the Earth’s surface. Assume the
    Earth’s radius is 3963 mi.
    How long does it take to circle the earth?
    Answer in units of h

    please help me i would be really grateful ps answer in thousandths place
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  2. #2
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    Re: Please help me with these physics/math problems. (desperate)

    1) acceleration is change in velocity per time

    2) find the time it takes you to drive 44 km and the time it takes your friend to drive 44 km

    3) Figure out the radius of its orbit then find the circumference of its orbit, work from there.
    Thanks from topsquark
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  3. #3
    Senior Member
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    Re: Please help me with these physics/math problems. (desperate)

    Quote Originally Posted by lazimlite View Post
    1.
    A tennis ball with a velocity of 10.9 m/s to
    the right is thrown perpendicularly at a wall.
    After striking the wall, the ball rebounds in
    the opposite direction with a velocity of −9.87
    m/s to the left.
    If the ball is in contact with the wall for
    0.011 s, what is the average acceleration of
    the ball while it is in contact with the wall?
    Answer in units of m/s
    2
    You and a friend each drive 44 km to the
    same destination. You travel at 89.2 km/h
    and your friend at 95.9 km/h.
    How long will your friend wait for you at
    the end of the trip?
    Answer in units of min
    3.
    The average speed of an orbiting space shuttle
    is 21100 mi/h. The shuttle is orbiting about
    248 mi above the Earth’s surface. Assume the
    Earth’s radius is 3963 mi.
    How long does it take to circle the earth?
    Answer in units of h

    please help me i would be really grateful ps answer in thousandths place
    Please ask one question at a time. Thanks.
    For the first question you will need to apply conservation of momentum.
    Thanks from topsquark
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