Answers

2016-06-23T21:59:42+08:00
Newton is simply written in N.
N= kg*m/s^2
acceleration= force over mass so 
mass will be equal to foce over acceleration
mass=14000N/5 m/s
mass=14000kg*m/s over 5m/s
(cancel m/s)
mass=2800 kg
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