A 5g bullet moving with an initial speed of 400m/s is fired into and passes through a 1kg block. The block, initially at rest on a frictionless, horizontal surface, is connected to a spring with spring constant k=900 N/m. if the block moves 5cm to the right after impact,   a) find the speed the bullet leaves the block with b) Calculate the amount of Mechanical energy lost in the collision

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