A mail carrier walked 7 m up, and then 9 m down. What was the mail carriers displacement?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Sound is a disturbance that travels through a medium as a