A 2 kg block hangs from a spring. A 1 kg block is placed on it and the system is initially in equilibrium. The 1 kg block suddenly falls away. Which statements are correct immediately after separation?

Select all that apply

• Option A

  The 2 kg block accelerates downward at 5 m s⁻² in configuration A.

• Option B

  In configuration B the 2 kg block has zero initial acceleration.

• Option C

  The spring force cannot change instantaneously.

• Option D

  The 1 kg block initially accelerates with g downward.