A 615 N student standing on a scale in an elevator notices that the scale reads 645 N.  From this information, the student knows that the elevator must be moving upward. true or false

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We can use Newtons second law of motion here.

Mass of student `= 615/9.81 = 62.7`

 

Weight of student act downward and the reaction of his weight act upward on the scale.

`uarr F = ma`

`645-615 = 62.7*a`

            ` a = 0.478m/s^2`

 

Since the acceleration is a positive value the elevator goes upward.

It is true.

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