問(wèn)題補(bǔ)充:?jiǎn)芜x題 某人將一質(zhì)量為4 kg的物體以5 m/s的速度拋出,拋出時(shí)人對(duì)物體做的功是?
A.20 J
B.50 J
C.100 J
D.638 J
答案:C
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