3. A 10 kg block is pressed againsT a horizonTally-moun'red spring of consTanT 2,000 N/m, compressing iT back 40 cm from equilibrium. If The spring is released from resT, aT whaT speed is The block moving when H passes Through The spring's equilibrium posiTion'? (A) 2.8 m/s (B) 5.7 m/s (C) 11.3 m/s (D) 32 m/s