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?
force= mass*acceleration
average velocity= distance/time
final velocity= 2*distance/time
acceleration= (finalvelocity-0)/time
= 2*distance/time^2
Or you can do it this way:
Vf^2=Vi^2 + 2 a d where a is Force/mass
45
To find the net force exerted on the race car, we can use Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration.
First, let's find the acceleration of the race car using the given information. We can use the formula:
acceleration = change in velocity / time
Given:
initial velocity (u) = 0 (because the car starts from rest)
final velocity (v) = distance / time = 38.0 m / 3.0 s = 12.67 m/s
time (t) = 3.0 s
Using the above formula, we can calculate the acceleration:
acceleration = (v - u) / t
acceleration = (12.67 m/s - 0) / 3.0 s
acceleration = 4.23 m/s^2
Now that we know the acceleration, we can use Newton's second law to find the net force. The formula is:
force (F) = mass (m) * acceleration (a)
Given:
mass (m) = 715 kg
acceleration (a) = 4.23 m/s^2 (from the previous calculation)
Using the above formula, we can calculate the net force:
force (F) = 715 kg * 4.23 m/s^2
force (F) = 3027.45 N
Therefore, the net force exerted on the race car is approximately 3027.45 Newtons.