Problem statementSolution video |

**DISCUSSION THREAD**

**Discussion and hints:**

Recall the following *f**our-step plan* outline in the lecture book and discussed in lecture:

**Step 1: FBD**

Draw a free body diagram of the system made up of A+B.

**Step 2: Kinetics (linear impulse/momentum and work/energy)**

From your FBD above, what is the external force acting on the system of A+B in the horizontal direction? What does this say about the linear momentum of this system in that direction? Also, are there any non-conservative forces acting on the system of A+B? What does this say about the mechanical energy of the system?

**Step 3: Kinematics**

At position 2, B is moving only in the horizontal direction. There is no vertical component of velocity of B at position 2.

**Step 4: Solve**

Solve for the speeds of A and B from the above equations.

Any questions?

I got a positive answer for vB and a negative answer for vA, but it seems that at position 2 the signs should be flipped as the ball A is moving in +x and block B is moving -x? Did anyone else also get this?

Never mind I flipped A and B lmao