Posted by **Chad** on Monday, February 6, 2012 at 1:28pm.

A block with mass m =7.3 kg is hung from a vertical spring. When the mass hangs in equilibrium, the spring stretches x = 0.21 m. While at this equilibrium position, the mass is then given an initial push downward at v = 4.5 m/s. The block oscillates on the spring without friction.

At t = 0.35 s what is the magnitude of the net force on the block?

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