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2015-09-19T23:29:33+05:30

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Force = 10 N  = mass * acceleration          ---  from  Newton's law.

Acceleration of  mass m1  =  F / m1 = 5 m/sec²
mass m1 = 10/5 = 2 kg

Acceleration of m2 = 15 m/s²
m2 = 10/15 = 2/3  kg.

total mass = m1 + m2 = 8/3 kg  when they are tied together.
acceleration =  F / mass =   10 N / (8/3) kg  = 3.75 m/sec²
 
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