1-1. The difference between instantaneous and average is that instantaneous is at a certain moment in time and average is over a period of time. The speedometer on a car shows you the instantaneous speed of your vehicle.
1-2. When you travel at the same over a period of time. 10m\s*30s = 300 meters over 30 seconds
1-3. Acceleration - is a vector quantity that is defined as the rate at which an object changes it's velocity. An object is accelerating if the velocity is changing. three different units for acceleration are m/s/s, mi/hr/s, km/hr/s, and an extra one is m/s2 (the 2 should be an exponent). you have traveled a total of 70 meters after accelerating at 7m/s for 4s.
2-1. The slope of a postion-time graph is equal to the velocity that the object was traveling. If the slope increases on a position time graph then the velocity increases as well.
2-2. Exercise 1= -3.0m/s Exercise 2 = 4 m/s. the easiest way to explain the way to get the answer is to show you the formula slope = (y2-y1) / (x2-x1). then you can just use the equation to find the answer.
2-3. The slope of a v/t graph is equal to acceleration. (Sorry can draw on blogger.) If the graph has a line that is moving up and to the right then the object is accelerating, and if the object is moving down and to the right then the object is decelerating. c, d, h
3-1. Free fall is an object that is falling on the sole influence of gravity. 9.80 m/s is the rate at which an object falls on earth.
3-2. The object is accelerating. the object is accelerating at acceleration = (7.55-3.90) / (2.01-1.00) = 3.61 m/s.
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