Write an expression for the time the arrow is in the air until it returns to launch height in terms of known quantities.

Late at night some traffic signals change patterns and become ?

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The main reason that you should secure loose objects in your car before you drive is that a. objects too close to the engine may be affected by the heat b. they are likely to get damaged moving around your car c. they may be thrown into a spot that disrupts your driving d. they will be more easily retrieved from a single storage location