I find it confusing :/
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m/s rate of change of dispalcement per sec. ie velocity
m/s^2 is (m/s)/s ie rate of change of velocity per sec. ie acceleration
m/s^2 is (m/s)/s ie rate of change of velocity per sec. ie acceleration
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m/s means the change of distance with time
m/s^2 means the change of speed with time
m/s^2 means the change of speed with time