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Q. A car can decelerate at -4.20 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 11° uphill? Assume the same static friction coefficient.

Q. A backpack full of books weighing 58.0 rests on a table in a physics laboratory classroom. A spring with a force constant of 150 is attached to the backpack and pulled horizontally. If the backpack begins to slide when the spring ( = 150 ) stretches by 2.40 , what is the coefficient of static friction between the backpack and the table?

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