test multiple fill in blank (id: cf3b5d776)

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[填空题]
A car with good tires a skq( rovoo6q 7go q-pl0a33:on a dry road can dec3ft(jyj347d;lrmoo k elerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ (only input numerical values)

参考答案:
空格1: 40±5%  空格2: 60±3% 


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