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
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.