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An elevator accelerates upwards, with $a = 1.0 m/s^2$. Inside the elevator are two stacked books, each $2.0 kg$ in mass.
How much normal force does the bottom book exert on the top book?
$17.62 \ N$
$19.62 \ N$
$21.62 \ N$
$35.24 \ N$
$39.24 \ N$