A car traveling east at 45.5 m/spasses a trooper hiding at the roadside. The dri

Question

A car traveling east at 45.5 m/spasses a trooper hiding at the roadside. The driver uniformlyreduces his speed to 25.0 m/s in 3.80s. (a) What is the magnitude and direction of thecar's acceleration as it slows down?
magnitude 1 m/s2 direction 2---Select---eastwestsouthnorth (b) How far does the car travel in the 3.80-s time period?
3 m (a) What is the magnitude and direction of thecar's acceleration as it slows down?
magnitude 1 m/s2 direction 2---Select---eastwestsouthnorth (b) How far does the car travel in the 3.80-s time period?
3 m magnitude 1 m/s2 direction 2---Select---eastwestsouthnorth

Explanation / Answer

Initial speed u = 38.5 m / s speed after 3.8 s is v = 25 m / s time t= 3.8 s (a). Magnitude of car's accleration a = ( v - u ) /t                                                         = -3.552 m / s^ 2 direction of accleration is opposite to the direction of carSo, direction of accleration is west (b). distance travelled in this time is S = ut + (1/ 2) at^ 2                                                           = 146.3 -25.65                                                           = 120.65 m

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