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?



Do I use F=ma so then m=707 and a=42/3 which is 14. So m=707 and a=14 and I multiply and it's 9898 N?

No the answer is 707/3.

Yes, to find the net force exerted on the race car, you can use Newton's second law of motion, which states that the net force acting on an object is equal to its mass times its acceleration (F = ma).

In this case, the mass of the race car is given as 707 kg, and the acceleration can be calculated by dividing the change in velocity (42.0 m) by the time taken (3.0 s). Therefore, the acceleration (a) is 14.0 m/s^2.

Now, you can substitute the values of mass (m) and acceleration (a) into the equation F = ma:

F = 707 kg * 14.0 m/s^2

Solving this equation, you will find that the net force exerted on the race car is indeed 9898 N. So, your calculation is correct.