本题目来源于试卷: Physics Unit7: Linear Momentum，类别为 通用国际物理
[单选题]
A 50-kg pitching machine (excluj *tmeishk.qbl +fw* :):mxh ;ding the rz fv.5i; vp)32lwxm mbaseball) is placed on a frozen pond. The machine fires a 0.4m;2zwm5vl v . i)fxrp30-kg baseball with a speed of 35 m/s in the horizontal direction. What is the recoil speed of the pitching machine? (Assume negligible friction.)
A. 0.14 m/s
B. 0.28 m/s
C. 0.70 m/s
D. $4.4 \times 10^{3} \; m/s$
参考答案: B
本题详细解析:
暂无
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