You have been asked to design a "ballistic spring system" tomeasure the speed of bullets. A bullet of mass m is firedinto a block of mass M. The block, with the embeddedbullet, then slides across a frictionless table and collides witha horizontal spring whose spring constant is k. The oppositeend of the spring is anchored to a wall. The spring'smaximum compression d is measured.Part AFind an expression for the bullet's initial speed vr in terms of m, M, k, and dk(m+M)VB = d.m2SubmitPrevious Answersv CorrectPart BWhat was the speed of a 1.80 g bullet if the block's mass is 1.20 kg and if the spring, with k = 49.0 N/m , was compressed by 16.0 cm ?"να ΑΣφ-VB =m/sSubmitRequest AnswerPart CWhat percentage of the bullet's initial kinetic energy is not converted into spring potential energy?Enter your answer to five significant figures.%

Using the formula of spring and combine with conservation of energy,

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