Question 4
1 pts
The stopping distance d of an automobile is directly proportional to the square of its
speed s. On one road, a car requires 75 feet to stop from a speed of 30 miles per hour.
How many feet does the car require to stop from a speed of 48 miles per hour on the
same road?

The car requires 192 ft to stop from a speed of 48 mph

Explanation:

Given:

Speed, u = 30 mph

Stopping distance, d = 75 feet

The stopping distance d of a car after the brakes are applied varies directly as the square of the speed, u

So,

d = k (u)²

On substituting the value:

75 = k (30)²

k =

Speed, u₂ = 48 mph

d₂ = ?

d₂ = k (u₂)²

On substituting the values we get:

d₂ =

d₂ = 192 ft

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.