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-   -   Escape car (https://www.askmehelpdesk.com/showthread.php?t=393299)

  • Sep 3, 2009, 06:57 PM
    bflsw09
    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?
  • Sep 3, 2009, 07:07 PM
    ballengerb1

    No figure to see
  • Sep 3, 2009, 07:14 PM
    bflsw09
    1 Attachment(s)
    Attachment 24189

    Image is attached
  • Sep 6, 2009, 12:22 PM
    Unknown008

    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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