Block A has a mass of 20 kg and block B has a mass of 50 kg.

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Block A has a mass of 20 kg and block B has a mass of 50 kg. If the spring is stretched 0.2 m at the instant shown, determine the acceleration of block B at this instant if it is
(a) Originally at rest, 

(b) Moving downward with a speed of 3 m/s.Neglect friction.

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