A advantage is less car accidents and a disadvantage is, in order to keep the roads clear of ice is a chemical. Like salt. Which is bad for the animals.
first we make a U turn and travel towards home in t = 20 s
so the distance of home from initial position is


Now after picking up the book we travel back with speed 20 m/s
so again after t = 20 s the displacement is given as

so the net displacement is given as


so it will be displaced by total displacement 200 m
You can use photo math for This
Rate of weathering depends on temperature and moisture. Cold dry places have less water to weather things
Hope this helped!
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This is false. Your hypothesis, or prediction, is just that: a prediction. Saying its a failure will result in bias.