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The problem is asking for the speed of an object at 15 seconds, given that it travels 54 meters from 13 seconds to 19 seconds.

### Solution:
The formula for **average speed** is:

\[
\text{Average speed} = \frac{\text{Distance}}{\text{Time interval}}
\]

1. The total distance traveled is \( 54 \, \text{m} \).
2. The time interval is from 13 seconds to 19 seconds, so:
   \[
   \text{Time interval} = 19 - 13 = 6 \, \text{seconds}.
   \]

Now, we calculate the average speed:
\[
\text{Average speed} = \frac{54 \, \text{m}}{6 \, \text{s}} = 9 \, \text{m/s}.
\]

Assuming the speed remains constant over the interval, the speed at 15 seconds is also **9 m/s**.

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### Related Questions:
1. How do you calculate the instantaneous speed at a specific time?
2. What are the differences between average speed and instantaneous speed?
3. How can you determine acceleration from this data?
4. What assumptions are made in calculating average speed over a time interval?
5. How do you find speed if the motion is not uniform?

### Tip:
When calculating average speed, always check the time interval carefully to ensure accuracy in your calculation.

Jika diketahui jarak yang ditempuh benda dari waktu 13 detik sampai 19 detik sebesar 54 meter, kecepatan benda pada waktu 15 detik adalah ....

Pelajari cara menghitung kecepatan benda pada waktu 15 detik ketika diketahui jarak yang ditempuh dari 13 detik hingga 19 detik adalah 54 meter. Soal ini mencakup konsep-konsep fisika dan kinematika, termasuk formula kecepatan rata-rata dan asumsi kecepatan konstan.

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