How Do You Calculate Final Speed and Net Force in Physics?

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SUMMARY

The discussion focuses on calculating the final speed and net force of a car with a mass of 2.25 × 103 kg that requires 5.8 kJ of work to accelerate from rest over a distance of 29.8 m. The final speed is determined using the equation 5800 J = 1/2 mv2, yielding a final speed of approximately 2.27 m/s. For the net horizontal force, the work-energy principle is applied, but clarification is needed regarding the net force concept, which refers to the vector sum of all forces acting on the car.

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Homework Statement


Part 1. A 2.25 × 10^3 kg car requires 5.8 kJ of work to move from rest to some final speed. During this time, the car moves 29.8 m.
Neglecting friction, find a) the final speed. Answer in units of m/s

Part 2.
b.)the net horizontal force exerted on the car. Answer in units of N

Homework Equations


For Part 1. I did 5800j=1/2mv^2 plugged in and got 2.2705848, which is correct
For Part 2 I guess it would be W=fdcos?

The Attempt at a Solution


For Part 1. I did 5800j=1/2mv^2 plugged in and got 2.2705848, which is correct
For part 2 I did 5800=fdcos but i am confused on what they mean by saying net.
 
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net force just means the vector sum of forces when different forces are applied to an object
 

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