A car traveling at 98 kilometers an hour comes to a stop in 15 seconds. What is the car's acceleration in kilometers an hour per second

To find the car's acceleration in kilometers per hour per second, we need to first convert the speed from kilometers per hour to meters per second.

1 kilometer = 1000 meters

1 hour = 3600 seconds

So, 98 kilometers per hour is equal to 98,000 meters per 3600 seconds.

Next, we need to calculate the change in velocity (final velocity - initial velocity) and the change in time.

The initial velocity (u) is 98,000 meters per 3600 seconds (or 98,000/3600 m/s).

The final velocity (v) is 0 meters per second because the car comes to a stop.

The change in time (t) is 15 seconds.

Now, we can calculate the acceleration (a) using the formula:

a = (v - u) / t

a = (0 - (98,000/3600)) / 15

Simplifying this equation:

a = (-98,000/3600) / 15

a ≈ -3.43 m/s²

Finally, we need to convert the acceleration from meters per second squared to kilometers per hour per second.

1 meter per second squared = 3.6 kilometers per hour per second

Therefore, the car's acceleration is approximately -3.43 m/s² * 3.6 km/h/s = -12.35 km/h/s.

So, the car's acceleration is approximately -12.35 kilometers per hour per second.

To find the car's acceleration in kilometers per hour per second, we need to first convert the given values of speed and time into consistent units.

The car's speed is given in kilometers per hour (km/h), and the time is given in seconds. To compare them, we need to convert the time from seconds to hours.

There are 60 minutes in an hour, and 60 seconds in a minute. So, there are 60 * 60 = 3600 seconds in an hour.

Now, we can calculate the car's acceleration in kilometers per hour per second.

Acceleration = (Final Velocity - Initial Velocity) / Time

Initial Velocity = 98 km/h
Final Velocity = 0 km/h
Time = 15 seconds = 15 / 3600 hours

Acceleration = (0 - 98) / (15 / 3600)

Simplifying this equation, we get:

Acceleration = -98 / (15 / 3600)

Now, let's calculate the result.

Acceleration = -98 / (15 / 3600)
Acceleration = -98 * (3600 / 15)
Acceleration = -98 * 240
Acceleration = -23,520 km/h per second

Therefore, the car's acceleration is -23,520 kilometers per hour per second (approximately). The negative sign indicates that the car is decelerating (coming to a stop).

Convert 98 km/h to 27.2 meters per second and divide that by 15 seconds.

The answer is really negative, since the car is decelerating