问题标题：
Anobjectmovesalongthexaxisaccordingtotheequationx(t)=(2.70t2-2.00t+3.00)m.(a)Determinetheaveragespeedbetweent=1.70sandt=2.90s.(b)Determinetheinstantaneousspeedatt=1.70sandatt=2.90s.(c)Determinetheaver
问题描述：
Anobjectmovesalongthexaxisaccordingtotheequationx(t)=(2.70t2-2.00t+3.00)m.
(a)Determinetheaveragespeedbetweent=1.70sandt=2.90s.
(b)Determinetheinstantaneousspeedatt=1.70sandatt=2.90s.
(c)Determinetheaverageaccelerationbetweent=1.70sandt=2.90s.
(d)Determinetheinstantaneousaccelerationatt=1.70sandt=2.90s.
盛俊明回答：
(a)10.42
(b)13.667.18
(c)5.4
(d)5.45.4
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