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Physics
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23 Nov 2019

a car traveling east (uphill) on University Avenue and
slamming on the brakes would accelerate west at 8 meters per secondsquared, and a car traveling west would accelerate east at 5.9meters per second squared. Find the stopping distance for eachdirection if the speed just at the brakes are applied is 20 m/s(about 45 miles per hour).

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A motorist suddenly notices a stalled car ahead and slams on brakes with an acceleration of 6.3 m/s^2. Unfortunately, the car collides. Police estimate the first car was moving at 5.0 m/s at the moment of the collison. They also measure skid marks 34 meters long. Assume each car has a mass of 1500kg. The speed limit on the road was 45 miles per hour. Was the incoming car speeding (i.e before applying the brakes)?

. Consider two cars, a 700kg Porsche and a 600kg Honda Civic. ThePorsche is speeding along at 40 m/s (mph) and the Civic is goinghalf the speed at 20 m/s. If the two cars brake to a stop with thesame constant acceleration, lets look at whether the amount of timerequired to come to a stop or the distance traveled prior tostopping is influenced by their initial velocity.

1. A car traveling 5m/s slams on its brakes, creating anacceleration of -2 m/s2. How far did the car travel after itapplied its brakes? __________

2. The same car traveling for 10m/s applies the same accelerationof -2 m/s2. How far did the car travel after it applied its brakes?__________


I am obviously using the formula wrong.. wouldn't it be d=at^2

A sports car claims that it can start from rest and reach 60mph (26.8 m/s) in a distance of 33.5 meters. To reach its maximummspeed, it accelerates at this constant rate for 11.25seconds.

a) How many seconds does it take to reach 60 mph?
- I got 1.25 seconds
b) What is the maximum speed of this car?
- Using kinematics I got 120.6 m/s
c) If the mass is 1900 kg, what force must the car provide tokeep it traveling at this maximum speed ( Hint: don't forgetfriction)
- I know that Fnet= mass x acceleration, and that gives me1900 x 10.72 = 20,368 N
but this is not taking into account friction. What role doesfriction play and how can I calculate it properly?
d) I was driving this car at a maximum speed on a test trackwhen a deer ran out in front of me. My reaction time was 0.5seconds, before I hit the brakes. Assuming that the engine is nolonger applying any forward force, and my wheels lock up, how farwill I travel before I come to a stop after seeing the deer (giveanswer in miles, using: 1 Km = 0.62 miles)?
e) How much time will elapse from the time that I see the deeruntil I stop?

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