The displacement of the racing car after 15 seconds is 450 meters.
How to find the displacement ?
To calculate the displacement of the racing car after 15 seconds, we can use the following equation:
Displacement = Average velocity * Time
Find the average velocity:
Since the acceleration is constant, the average velocity during the 15 seconds will be the average of the initial and final velocities.
Initial velocity (u) = 0 m/s (as the car starts from rest)
Final velocity (v) can be found using the equation: v = u + at, where a is the acceleration (4 m/s²) and t is the time (15 seconds)
v = 0 + 4 * 15
= 60 m/s
Average velocity = (u + v) / 2 = (0 + 60) / 2
= 30 m/s
Calculate the displacement:
Displacement = Average velocity * Time = 30 m/s * 15 seconds
= 450 meters