Step-by-step explanation:
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(a) The segment A shows acceleration as velocity increases with the increase in time.
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(b) The segment C shows the object is slowing down as the time increases in segment C, the velocity decreases and afterwards it comes to rest.
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(c) The velocity is segment B is 40m/s. And in the diagram there is no change in velocity.
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(d) The acceleration of segment B is zero. As there in no change in curve and it is moving with uniform velocity.
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Thank you!