Knowing that at the instant shown assembly A has a velocity

Knowing that at the instant shown assembly A has a velocity of 9 in/s and an acceleration of 15 in/s2 , both directed downwards, determine:

The velocity of block B relative to block A

The acceleration of block B relative to block A

= 50°

The solution is simple for relative velocity from figure..

Displacement equation

Xa +2 Xb/a = constant

ACCELERATION OF BLOCK AND VELOCITY AS WELL WILL BE HALF OF THAT OF A AS STRING CONNECTED TO B HAS TWICE THE TENSION OF STRING IN CASE OF B.

VELOCITY OF B/A=9/2 M/S=4.5M/S

ACCELERATION OF B/A =15/2=7.5M/S^2