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2 years ago

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A motorist makes a trip of 180 miles. For the first 90 mph she drives at a constant speed of 30 mph. What constant speed must sh

e drives the remaining distance if her average speed for the total trip is to be 40 mph

1 answer:

Likurg_2 [28]2 years ago

5 0

I think it is 50 mhp because it's in half

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The driver of a car traveling on the highway suddenly slams on the brakes because of a slowdown in traffic ahead. A) If the car’

ladessa [460]

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Acceleration is -30000 mi/h²

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Explanation:

t = Time taken for the car to slow down = 3 s =

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v = Final velocity = 50 mi/h

s = Displacement

a = Acceleration

Equation of motion

$v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow a=\frac{50-75}{\frac{3}{3600}}\\\Rightarrow a=-30000\ mi/h^2$

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Converting to feet

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Distance travelled in the 3 seconds of deceleration is 261.888 feet

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