It is determined that more than $3500$N of compression force in the lower back $($L$4/$L$5$ vertebrae$)$ is unsafe for workers. At which object mass is the job safe for the MALE worker.$$

Question $1$Answer

a$.$

$5$ KG

b$.$

$12$ KG

c$.$

$20$ KG

d$.$

$35$ KG