What am I doing wrong? the simple method of calculating the error for the additi

Question

What am I doing wrong?

the simple method of calculating the error for the addition/subtraction of two numbers. (Lea Time (s) | x (cm) 1/30 | 2.5 ± 0.1 2/30 | 2.8 ± 0.1 3/30 | 3.2 ± 0.1 4/30 | 3.4 ± 0.1 5/30 | 3.8 ± 0.1 You are correct. Computer's answer now shown above ries Your receipt no. is 161-7605 Exercise 2 - Calculating the Velocity of the Cart The next step s to calculate the velocity of the car for each interval. From class. you earn that the velocity is a As an example it takes 1/30th s to travel a distance o 2.50.1 cm. This gives the velocity to be 75 3 cm/s. The uncertainty for the time is negligible for this experiment, so the uncertainty for the velocity is cm/s 3 cm/s. Calculate the velocity for each interval and enter the values below d placement me taRe Time (s) Average Velocity (cm/s) 75 ± 3 1/60 3/60 42 5/60 7160 25.5 9/60 32 22.8 Submit Answer Incorrect. Tries 5/10 Previous Tries

Explanation / Answer

Try to enter the answers without decimal places.

You need to maintain the same number of decimal places as the uncertainity, which is zero in this case, as uncertainities are whole numbers.

Also, average velocities for each interval are asked. Hence, to find average velocity at say 5/60, calculate the displacement between 6/60(i.e.3/30) and 4/60 i.e. 2/30 and divide by the time interval, i.e 1/30 seconds.

i.e [(3.2+/-0.1)-(2.8+/-0.1)]/(1/30)

=(0.4+/-0.2)*30

=12+/-6 cm/s

Similarly, answers are:

9+/-6

12+/-6

6+/-6

12+/-6

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