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一颗速度较大的子弹,水平穿透原来静止在光滑水平面上的木块。假设子弹所受阻力与速度无关,则下列说法正确的是(A.)子弹入射速度越大,木块获得的动能越大。(B.)子弹入射速度越大,木块获得的动能越小。(C.)木块获得的动能与子弹入射速度的大小无关。《物理教学》1988年9期所载“关于子弹穿透木块的问题”一文,对此问题采用根据子弹穿透木块过程中系统的动量守恒、能量守恒且机械能损失恒定,先得出
A bullet with a higher velocity penetrates horizontally into a wooden block that was originally resting on a smooth level. Assuming that the resistance to the bullet is not related to speed, the following statement is correct: (A.) The greater the incident speed of the bullet, the greater the kinetic energy obtained by the block. (B.) The higher the incident speed of the bullet, the smaller the kinetic energy obtained by the block. (C.) The kinetic energy obtained by the block is independent of the incident speed of the bullet. In the article “Physical bulletin penetrating wood blocks” contained in “Physics Education”, Issue 9, 1988, the problem is based on conservation of momentum, conservation of energy, and loss of mechanical energy during the process of penetrating wooden blocks by bullets. Out