A rifle bullet with mass 4.00 gm strikes and embeds itself in a block with mass 0.996 Kg that rests on a frictionless, horizontal surface and is attached to a coil spring. The impact compresses the spring 15.0 cm. Calibration of the spring shows that a force of 0.750 N is required to compress the spring 0.75 cm. What was the bullet's initial speed? wwww

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