[نظرة امل]

the driver of a 1750 kg car traveling on a horizontal road at 110 km/h suddenly applies the brakes . Due to a slippery pavement, the friction of the road on the tires of the car , which is what slows down the car , is 25% of the weight of the car (a)what is the acceleration of the car ? (b)how many meter does it travel before stopping under these condition?



__________

You drag a heavy box along along a rough horizontal floor by a horizontal rope. Identify the reaction force to each of the fol-lowing forces : (a)the pull of the rope the box,(b)the friction force on the box,(c)the normal force on the box ,and (d)the weight of the box.


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