A man of mass M stands on a weighing machine in an elevator accelerating upwards with an acceleration a. Draw the free-body diagram of the man as observed by the observer A (stationary on the ground) and observer B (stationary on the elevator). Also, calculate the reading of the weighing machine.
![984609_2ea42fa2a4e04760a464df92c08c61a9.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/984609_2ea42fa2a4e04760a464df92c08c61a9.png)