Solve the Problem $\mathrm { s } = \mathrm { t } ^ { 2 } - 7 \mathrm { t } + 4$

question 208

Multiple Choice

Solve the problem.
-The position of a body moving on a coordinate line is given by $\mathrm { s } = \mathrm { t } ^ { 2 } - 7 \mathrm { t } + 4$ , with $\mathrm { s }$ in meters and $\mathrm { t }$ in seconds. When, if ever, during the interval $0 \leq t \leq 7$ does the body change direction?

• A) t = 7 sec
• B) t = 14 sec
• C) t = 3.5 sec
• D) no change in direction

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