If a 150 pound man walks onto an elevator. Suddenly it rises rapidly from the 1st to 14th floor. if the man steps onto a scale in the elevator during the rapid rise, he would weigh...

Question

A) 150 pounds
B) More than 150 pounds
C) Less than 150 pounds

Please explain, thank you.

Answer 1

Ftotal on man = m a
Force F up on man from scale, mg down on man
F - mg = ma
so
F = m g + m a
if a is + up then F bigger from scale