What's the value of the two#?# ? I don't understand what's the question is asking actually and have no idea on what method to use to calculate. :(
You are testing your brand new Ferrari Testarossa. To see how well the brakes work you accelerate to 100 miles per hour, slam on the brakes, and determine that you brought the car to a stop over a distance of 487 feet. Assuming a constant deceleration you figure that that deceleration is #?# feet per second squared. (Enter a positive number.)
I trust that you don't have the courage to try this, but that night you wonder how long it would take you to stop (with the same constant deceleration) if you were moving at 200 miles per hour. Your stopping distance would be #?# feet. (Enter a number, not an arithmetic expression.)
You are testing your brand new Ferrari Testarossa. To see how well the brakes work you accelerate to 100 miles per hour, slam on the brakes, and determine that you brought the car to a stop over a distance of 487 feet. Assuming a constant deceleration you figure that that deceleration is
I trust that you don't have the courage to try this, but that night you wonder how long it would take you to stop (with the same constant deceleration) if you were moving at 200 miles per hour. Your stopping distance would be
1 Answer
Part one:
Part two:
Explanation:
.
where
In this problem:
Each mile is 5280 feet. That says that the car's velocity was:
Now, we can plug the value into the velocity equation above to solve for acceleration:
It is negative because we have deceleration.
The distance formula is:
in our problem
Now, we can plug this into the acceleration equation and find
For part two,
Since we have the same constant deceleration, we can plug it in and find the time it takes for the car to stop from