Aman walks 54.5 meters east, then another 30 meter east. calculate his displacement relative to where he started.

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

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