A ball of mass $m$ moving with velocity $u$ collides with a second ball of mass $M$ that is initially at rest. After the collision, the two balls move with velocities $v$ and $V$ respectively, in the directions shown. A student then writes three equations for the collision. Which row in the table shows which equations are correct and which are incorrect? Equations: 1. $mu = M V + m v$ 2. $m v \sin 30^{\circ} = M V \sin 40^{\circ}$ 3. $mu = m v \cos 30^{\circ} + M V \cos 40^{\circ}$
- Acorrect, correct, correct
- Bincorrect, correct, incorrect
- Ccorrect, incorrect, incorrect
- Dincorrect, correct, correct