Posted by Heart on Wednesday, December 23, 2009 at 9:23pm.
A race car has a mass of 710 kg. It starts from rest and travels 40.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?

physics =)  MathMate, Wednesday, December 23, 2009 at 9:34pm
First calculate the acceleration from the distance and time using the formula:
S=v0t+(1/2)at²
where
a=acceleration
S=distance
v0=initial velocity
t=time
a=2(Sv0t)/t² (assumed uniform)
Find force F from
F=ma

physics =)  Heart, Wednesday, December 23, 2009 at 9:38pm
Thanks a lot! I got F = 6311.11 N.

physics :)  MathMate, Thursday, December 24, 2009 at 7:41am
The answer is correct!
Have a merry Christmas, and enjoy your holidays!

physics =)  drwls, Thursday, December 24, 2009 at 8:17am
F*X = KE increase = (1/2) M Vfinal^2
Vfinal = 2*Vaverage = 2*X/T =2*(40/3) = 26.67 m/s
F = (1/2)*(710)*(26.67)^2/40 = 6313 N
We agree
Answer This Question
Related Questions
 physics  A race car has a mass of 705 kg. It starts from rest and travels 39.0 ...
 Physics  A race car has a mass of 715 kg. It starts from rest and travels 38.0 ...
 Physics  1.A race car has a mass of 707 kg. It starts from rest and travels 42....
 Physics  1.A race car has a mass of 707 kg. It starts from rest and travels 42....
 physics5  A race car has a mass of 707 kg. It starts from rest and travels 40 m...
 physics 11  A 1200 kg car on a horizontal surface starts from rest and ...
 Physics  1.A race car has a mass of 707 kg. It starts from rest and travels 42....
 AP physics  A 1280kg car starts from rest and accelerates to 80 km/h in 23.0 s...
 Physics  A race car has a mass of 714 kg. It accelerates uniformly from rest, ...
 physics  A 1200 kg car on a horizontal surface starts from rest and ...
More Related Questions