The answers are handwritten.

So far I have:

Since the direction of the velocity of A is in the

**j** direction, and the velocity of B is in the

**-i** direction, the instantaneous centre of rotation is C. Is this a correct method?

Since C is the instantaneous centre of rotation,

Speed of B: V_B=(BC)w= 6 m/s

Speed of A: V_A=(AC)w= 8 m/s

**V_A**=

**w_OA**x

**r_A/O**
=>Angular Velocity of OA:

**w_OA**=80

**k** rad/s

**V_B**=

**w_BC**x

**r_B/C**
=>Angular Velocity of BC:

**w_BC**=-40

**k** rad/s (wrong direction?)

=>Angular Velocity of DC:

**w_DC**=

**w_BC**=-40

**k** rad/s

Then I'm stuck. I think I could use

**a_A**=(alpha)x

**r**+

**w**x(

**w**x

**r**) but I don't know how to find

**a_A**
Any help would be greatly appreciated.