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A driver is traveling at 72 km/hr when she sees a red light in the distance. She keeps traveling at this speed for two seconds, and then applies the brakes, decelerating the car to a stop at a rate of -5 m/s2.
1. Convert the driver's initial speed into units of m/s.
2. Compute her total stopping time, measured from the point where she first notices the red light.
3. Calculate her total stopping distance, gauged from the point where she first notices the red light.
4. Compute her average speed, measured from the point where she first notices the red light to the point when her car comes to a stop.
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in astronomy it is common to expose a photographic plate to a particular portion of the night sky for quite some time
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A 25-kg box slides, from rest, down a 9.0-m-long incline that makes an angle of 15° with the horizontal. What is the change in the potential energy of the box
In a typical photon experiment the photon is depicted as moving across the page, say from right to left. Assume we were actually able to witness such an experiment, from the side (to position of reader to a page)
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