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Sagot :
Answer:
The car moving with speed 50 mph
Explanation:
We are given that
Distance, s=280 feet=85.3 m
1 feet=0.3048 m
Coefficient of kinetic friction=[tex]\mu_s=0.3[/tex]
1 m/s=2.237 mph
We have to find the speed of car moving.
Speed, v=[tex]\sqrt{2\mu_s gs}[/tex]
Where [tex]g=9.8ms^{-2}[/tex]
Using the formula
Speed of the car,v=[tex]\sqrt{2\times 0.3\times 9.8\times 85.3}[/tex]
Speed of the car,v=22.4 m/s
Speed of the car, v=[tex]22.4\times 2.237\approx 50 mph[/tex]
Hence, the car moving with speed 50 mph
Option d is true.
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