In a classroom demonstration, an instructor tosses her keys Westward and slightl
ID: 2160514 • Letter: I
Question
In a classroom demonstration, an instructor tosses her keys Westward and slightly Upward. A set of motion sensors, attached to a computer, is used to record the position of the keys with respect to a mark on the floor at the instructor's feet. Six positions are recorded, in meters; there are 0.2 of a second between each data point. You are given the computer output in the table below; the direction of each horizontal position is West, and the direction of each vertical position is Up (i.e. above the floor).
HINT: This question will ask you to make many repetitive calculations. To make your work easier, enter the table into a spreadsheet and use the formula function of the spreadsheet to perform the calculations.
(a) Between 0.0 and 0.2 of a second, what was the average horizontal velocity of the keys?
m/s
(b) Between 0.0 and 0.2 of a second, what was the average vertical velocity of the keys?
m/s
(c) Between 0.2 and 0.4 of a second, what was the average horizontal velocity of the keys?
m/s
(d) Between 0.2 and 0.4 of a second, what was the average vertical velocity of the keys?
m/s
(e) By now, you should have noticed a pattern for the average horizontal velocities in each interval. We will not ask about the average horizontal velocities for the final three intervals.
(f) Between 0.4 and 0.6 of a second, what was the average vertical velocity of the keys?
m/s
(g) By now, you should have noticed a pattern for the average horizontal velocities in each interval. We will not ask about the average horizontal velocities for the final three intervals.
(h) Between 0.6 and 0.8 of a second, what was the average vertical velocity of the keys?
m/s
(i) By now, you should have noticed a pattern for the average horizontal velocities in each interval. We will not ask about the average horizontal velocities for the final three intervals.
(j) Between 0.8 and 1.0 seconds, what was the average vertical velocity of the keys?
m/s
1
2
0.2
1.92
2.444
0.4
2.84
2.496
0.6
3.76
2.156
0.8
4.68
1.424
1.0
5.6
0.3
Explanation / Answer
please rate as lifesaver first and if any questions then ask in comments and i will answer them a)1.92-1/0.2 = 4.6 m/s b)2.444-2/0.2 = 2.22 m/s c)2.84-1.92/0.2 = 4.6 m/s d)2.496-2.444/0.2 = 0.26 m/s e)no question f)2.156-2.496/0.2 = -1.7 m/s g)no question h)1.424-2.156/0.2 = -3.66 m/s i)no question j)0.3-1.424/0.2 = -5.62 m/s