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A man pulling an empty wagon causes it to accelerate at 1.4m/s2 . What will the acceleration be if he pulls with the same force when the wagon contains a child whose mass is three times that of the wagon?
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Let,
Initial  mass=m_1
Initial acceleration=a_1
Final mass=m_2
Final acceleration=a_2

Since force is constant,
m_1*a_1=m_2*a_2
>> m_1 * 1.4= (m_1+3m_1)*a_2
>> m_1 * 1.4=4 * m_1 * a_2
>> a_2= 1.4 / 4
>> a_2= 0.35 m/s^2

a_2 = 0.35 m/s^2
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