# physics =)

posted by .

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 =) -

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(S-v0t)/t² (assumed uniform)

Find force F from
F=ma

• physics =) -

Thanks a lot! I got F = 6311.11 N.

• physics :) -

Have a merry Christmas, and enjoy your holidays!

• physics =) -

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

## Similar Questions

1. ### Physics

1.A race car has a mass of 707 kg. It starts from rest and travels 42.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
2. ### Physics

1.A race car has a mass of 707 kg. It starts from rest and travels 42.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
3. ### Physics

1.A race car has a mass of 707 kg. It starts from rest and travels 42.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
4. ### Physics

A race car has a mass of 715 kg. It starts from rest and travels 38.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
5. ### physics 11

A 1200 kg car on a horizontal surface starts from rest and accelerates uniformly to 72 km/h in 20.0 s. Friction exets an average force of 450 N on the car during this time. a) what is the net work done on the car b) how far does the …
6. ### physics

A 1200 kg car on a horizontal surface starts from rest and accelerates uniformly to 72 km/h in 20.0 s. Friction exets an average force of 450 N on the car during this time. a) what is the net work done on the car b) how far does the …
7. ### physics

A race car has a mass of 705 kg. It starts from rest and travels 39.0 m in 3.0 s. The car is uniformly accelerated during the entire time. What net force is exerted on it?
8. ### physics5

A race car has a mass of 707 kg. It starts from rest and travels 40 m in 4.0 s. The car is uniformly accelerated during the entire time. What net force is applied to it?
9. ### AP physics

A 1280-kg car starts from rest and accelerates to 80 km/h in 23.0 s. Friction exerts an average force of 449 N on the car during this time. (a) What is the net work done on the car?
10. ### Physics

A race car has a mass of 714 kg. It accelerates uniformly from rest, and travels 55 m in 2.95 s. What is the acceleration of the car?

More Similar Questions