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Relative Motion and Acceleration

How can I solve this problem below:

At t=0, wedge A starts moving to the right with a constant acceleration of 100 mm/s^2 and block B starts moving along the wedge toward the left with a constant acceleration of 150 mm/s^2 relative to the wedge.
Determine the acceleration of block B.

The answer for verification is 80.7 mm/s^2 with an angle of 68.3 degree west of south.


Solution Summary

The answer is given underneath the image of attached with the question in a new attachment with a 150-200 word explanation.