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21.4 A 2.00 kg block is placed against a spring on a 30 incline. The spring, whose spring constant is k=1960 N/m, is compressed 0.05 m and released. What is the velocity v of the block when it returns to the uncompressed position of the spring? (A) 1.57 m/s (B) 0.96 m/s 2.00 kg (C) 2.14 m/s (D) 1.40 m/s k- 19.6 N/ cm 30.0 (E) 1.17 m/s