A 1100 kg car coast on a horizontal road with a speed of 19m/s. After crossing a

Question

A 1100 kg car coast on a horizontal road with a speed of 19m/s. After crossing an unpaved, sandy stretch of road 32 m long,its speed decreases to 12 m/s. Find the magnitude of the averagenet force on the car in the sandy section. I know that the net work done on the car is negative becauseits speed decreased from 19 m/s to 12m/s. Im not for sure how tofind the magnitude though. A 1100 kg car coast on a horizontal road with a speed of 19m/s. After crossing an unpaved, sandy stretch of road 32 m long,its speed decreases to 12 m/s. Find the magnitude of the averagenet force on the car in the sandy section. I know that the net work done on the car is negative becauseits speed decreased from 19 m/s to 12m/s. Im not for sure how tofind the magnitude though.

Explanation / Answer

   the acceleration is found from the equationof motion that    v2 - u2 = 2 a s    (12 m / s) - (19 m / s)2 = 2 a(32 m)    a = ...... m / s2    F = (1100 kg) a       = ...... N

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