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Consider that you are taking a trip with a train which makes curvy motion and then it makes quite smooth motion with a velocity of 21.0 m/s m/s , but the conductor sees a blockage which is 39.0 m away from him on the railroad. The train travels with a constant velocity for a period of reaction time of 0.840 s , then brake suddenly and slowing down the train at constant acceleration so that the conductor can makes to stop right in front of the blockage.
a - Using the exact same accceleration and reaction time, if the train traveled around the curve with a velocity of 26.0 m/s instead of 21.0 m/s , What would be the velocity of the train when it smash the blockage?
b- How much time the train would travel until hitting the blockage?
Suppose your bathroom scale reads your mass as 85 kg, with an 8% uncertainty. What is the uncertainty in your mass? (Note that uncertainties should be reported to one significant figure.)
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