Posted by josh on Thursday, October 1, 2009 at 5:06pm.
What average force in N is required to stop an 1,188 kg car in 9 s if it is initially traveling at 89 km/h?
f=ma
f=1,188(9.8)
f=11642.4N
This looks wrong to me. Can someone explain this to me.

physics  bobpursley, Thursday, October 1, 2009 at 5:19pm
Why did you choose 9.8 as the acceleration? It is not falling.
its average velocity during stopping is 89/2 km/hr (change that to m/s)
So it traveled in that time a distance of avgvelocity*9s...
force*distance=initial KE= 1/2 m vi^2
change vi to m/s, then solve for force.

physics  Anonymous, Thursday, October 1, 2009 at 5:32pm
Firstly F=ma but a=(vu)/t. First convert the 89 Km/h into m/s.
89x1000/3600=24.72m/s
Then using F=m(vu)/t
F=1188(24.720)/9
F=3263.04N

Physics  Kat, Sunday, October 23, 2016 at 7:57pm
What is the average force need to stop a 1500 N car in 8.0 S if it is traveling at 90 km/hr?
Answer This Question
Related Questions
 physics  A car (mass = 750 kg) is initially moving with velocity 30 m/s. The ...
 physics  What average force is required to stop an 1900 car in 6.0 if the car ...
 Physics  What average force is required to stop an 1600 kg car in 8.0 s if the...
 physics  What average force is required to stop an 1300 kg car in 9.0 s if the...
 Physics  What average force is required to stop an 1700 kg car in 7.0 s if the ...
 Physics  What average force is required to stop an 1700 car in 7.0 if the car ...
 physics  What average force is required to stop a 920kg car in 7.7s if the car ...
 Physics  What is the magnitude of the average force required to stop an 1400kg ...
 Physics  A car moving initially at a speed of 80 km/h and weighing 13,000 N is ...
 PHYSICS  A CAR IS MOVING INITIALLY AT A SPEED OF 50MI/H WEIGHTING 3000LB IS ...
More Related Questions