A student calculated the final velocity of a train that decelerated from 30.5 m/s and got an answer of âˆ’43.34 m/s. which of the following might indicate that he made a mistake in his calculation?
a) The sign of the final velocity is wrong. b) The magnitude of the answer is too small c) There are too few significant digits in the answer d) The units in the initial velocity are incorrect.

Question

26-10-2022
Physics

Answered

A student calculated the final velocity of a train that decelerated from 30.5 m/s and got an answer of âˆ’43.34 m/s. which of the following might indicate that he made a mistake in his calculation?
a) The sign of the final velocity is wrong. b) The magnitude of the answer is too small c) There are too few significant digits in the answer d) The units in the initial velocity are incorrect.

Answer :

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kjuli1766 kjuli1766 · Answer 1 · 2022-10-31T06:21:03-04:00

The sign of the final velocity is wrong. Option A.

Deceleration is calculated by dividing the final velocity minus the initial velocity by the time it takes for this velocity to drop. Here the acceleration formula can be used with a negative sign to determine the deceleration value. Initial velocity describes how fast an object moves when gravity first exerts a force on it.

Terminal velocity, on the other hand, is a vector quantity that measures the speed and direction of a moving body after reaching its maximum acceleration. Initial Velocity at Zero Time from this figure to equal the square root of two s over a. No, we set the value S to 200 m and the acceleration a to 4 m per square second. So we get a time of 10 seconds. The resolution is now complete.

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