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Introduction, Measurement, Estimating

One lightyear is defined to be the distance light can travel in one year.
- What is this distance in meters?
- How long does it take for light to get to the Moon
Multiply 1.783 x 10² * 4.4 x 10^-3, taking into account significant figures.
What is the surface area of a sphere of diameter 2.4 x10² cm?
What is larger 4000 L or 4 x 10⁵ cm³ and you must show your reasoning.
A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds.
- Calculate the average speed of the car for the first part of the trip.
- Find the average velocity of the car.
A sports car moving at constant speed travels 150 m in 4.00 s. If it then brakes and comes to a stop while decelerating at a rate of 6.0 m/s². How long does it take to stop?
Explain a possible situation where you start with a positive velocity that decreases to a negative increasing velocity while there is a constant negative acceleration.
A stone is dropped from the roof of a high building. A second stone is dropped 1.25 s later. How long does it take for the stones to be 25.0 meters apart?

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