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    bflsw09's Avatar
    bflsw09 Posts: 13, Reputation: 1
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    #1

    Sep 3, 2009, 06:57 PM
    escape car
    A thief is trying to escape from a parking garage after completing a robbery, and the thief's car is speeding toward the door of the parking garage (see figure). When the thief is L = 32 m from the door, a police officer flips a switch to close the garage door. The door starts at a height of 1.8 m and moves downward at 0.22 m/s. If the thief's car is 1.2 m tall, what should be the minimum speed of his car to escape?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #2

    Sep 3, 2009, 07:07 PM

    No figure to see
    bflsw09's Avatar
    bflsw09 Posts: 13, Reputation: 1
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    #3

    Sep 3, 2009, 07:14 PM
    Name: theif car.jpg Views: 413 Size: 23.9 KB

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    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Sep 6, 2009, 12:22 PM

    For the car to escape in the limits, the height of the door have to be 1.2 m above the ground. Here, we'll assume that the car is 1.2m at a point only, and we'll consider the length of the car to be negligible.

    Find the time for the door to be 1.2 m above the ground.
    The car has to travel distance L within that time.
    Can you find the speed?
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