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Math Help - Calculating velocity, accelerated motion

  1. #1
    Member
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    May 2008
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    101

    Calculating velocity, accelerated motion

    Please help with calculating the required numbers.

    1) A car moves at 20ms/per second when he brakes. These brakes deliver 4g's in deceleration (4 x 9.8ms/s). Find the time to stop after applying the brakes.

    2a) A child throws a ball up at an initial velocity of 49ms/s. How high will it go?
    2b) How long will it take to reach this distance?
    2c) A stone is thrown does a 500m cliff with a velocity of 49m/s ^-1. How long will it take to impact and how fast is it?

    3) A car travels at 36km/h. He sees an obstacle and after a 0.2 sec reaction time, he decelerates at 20m/s ^(-2). What is the minimum stopping time?

    4) A car travels at 20 m/s ^-1. He sees an obstacle 10m and reacts in 0.4 sec. He decelerates at 20m/s ^-2. Find:
    a) The distance the car moves before he reacts
    b) The distance the car moves during braking
    c) The total stopping distance

    5) A sprinter leaps from the starting block and reaches a velocity of 11m/s in 0.5 sec. If acceleration is uniform at the start, what is the acceleration?


    Thank you.
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  2. #2
    Newbie
    Joined
    Jul 2008
    Posts
    21
    Crikey is that all your homework?!!!!

    Have you heard of UVAST equations?

    Ill help if your struggling with uvast but it seems you want the work done for you!!!!!
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