i)which would require a greater force accelerating a 2 kg mass at 5m/s2  or a 4 kg mass at 2m/s2           ?
ii) write  SI unit of  force 


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2kg mass need more force. SI unit of force NEWTON.
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i)Accelerating a 2kg mass at 5m/s^2 require more force. ii) SI unit of force is Newton(N)
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