#"while elevator is stops ,bathroom scale show only the weight of man."#
#G=m*g=691" "N#
#"The tension on cable is the sum of the man's and the elevator's weights."#
#"Tension="G+G_("elevator")#
#"When the elevator is accelerated downwards, there is an "#
#"inertia force in the reverse direction."#
#"This inertial force reduces the weight on the bathroom scale."#
#"inertial force=691-499=299" "N#
#"Now ,let use the Newton's second law of motion."#
#F=m*a#
#m:"mass of man"#
#a:"acceleration"#
#299=691/(9.81)*a#
#a=(299.9.81)/691#
#a=4.24" "m/s^2#