How to find displaement, speed and velocity?

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To find the velocity after 3.0 seconds of braking, the car's initial speed of 25 m/s decreases by 15 m/s (5 m/s² * 3 s), resulting in a final velocity of 10 m/s. The total displacement over 14.0 seconds can be calculated by summing the distances covered during each phase: 125 meters during the initial 5 seconds, 15 meters during the braking phase, and 60 meters during the final 6 seconds, totaling 200 meters. The average speed for the entire 14.0 seconds is determined by dividing the total displacement by the total time, yielding an average speed of approximately 14.29 m/s. It is essential to apply the correct kinematic equations to solve these problems accurately. Understanding these concepts is crucial for mastering displacement, speed, and velocity in physics.
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Homework Statement



A car initially traveling to the right at a steady speed of 25m/s for 5.0s applies its brakes and slows down at a constant rate of 5 m/s^2 for 3.0s. It then continues with no additional braking for another 6.0s. B) what is the velocity after 3.0s of braking? C) what was the displacement during the total 14.0s of its motion? D) What was the average speed for 14.0s?



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