Time remaining:
A car can brake to a stop from 60mph in 2.6 seconds. If the car has a weight of

Physics
Tutor: None Selected Time limit: 0 Hours

A car can brake to a stop from 60mph in 2.6 seconds. If the car has a weight of 3225 ibs, what force in Newton's acts on the car.

I got F= -15122.3N is that correct?

Apr 26th, 2015

F=ma, vt=v0+at, a=(vt-v0)/t=(0-60mph)/2.6s=-23.1m/s^2

3225 lbs=1462.84 kg

thus F=1462.84kg*(-23.1m/s^2)=-63.3N

Apr 26th, 2015

I solved for acceleration by using

a= (V^2 - V^1)/t
a= (0-88ft/sec)/2.6 sec
a= -10.316 m/s^2
-10.32N  then solved for force by using

: 3225 lbs * (1 kg / 2.2 lbs) = 1465.91 kg
Thus,
F = 1465.91 kg * -10.316 m/s^2
F = -15122.3 N

What went wrong???


Apr 26th, 2015

F=ma, vt=v0+at, a=(vt-v0)/t=(0-26.8m/s)/2.6s=-10.3m/s^2

You are right, I am wrong :(

I forgot to convert mph to m/s

don't learn from me

the method you are using is also correct

good job, thumbs up!


Apr 26th, 2015

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
...
Apr 26th, 2015
...
Apr 26th, 2015
Mar 24th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer