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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

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?