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Jamal watches his older brother Robert lift weights. the bar alone had a mass of 20 kg. on the bar he had two 11.4 kg weights two 4.5 kg weight and four 450 g weights. what mass what's Robert lifting

Answer :

Total mass=20+2(11.4)+2(4.5)+4(0.450)
=20+22.800+9+1.800
=53.600 kg.

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