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Answer: net force on system = 60-10 = 50N toward left
Acceleration of system = 50/(7+2+1) = 5m/s^2
Force by 2kg mass on 1kg mass = N-10= ma
N = 10+1*5 = 15N
Force by 7 kg mass on 2kg mass = N-10 = (1+2)*5
N = 25N
Explanation:
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