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m=40g,4×10
−2
kg,v=2cm/s=2×10
−2
m/s
N=mg
(4×10
−2
)9.8N
39.2×10
−2
N
0.392N
Answer is D
−2
kg,v=2cm/s=2×10
−2
m/s
N=mg
(4×10
−2
)9.8N
39.2×10
−2
N
0.392N
Answer is D
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