The elevator shown in figure (5-E5) is descending with an acceleration of 2 m/s2. The mass of the block A is 0.5 kg. What force is exerted by the block A on the block B?



Seeing from the frame of reference of the elevator a pseudo upward force must be acting on the box A.


Thus, the apparent weight of the box


Now, the reaction force on the box B due to A is



1