The body moved at a speed of 15 km / h for 2 hours, then did not move for an hour, then for 3 hours
| September 3, 2021 | education
The body moved at a speed of 15 km / h for 2 hours, then did not move for an hour, then for 3 hours it moved at a speed of 40 km / h. Determine the average speed of body movement.
To determine the average speed of a given body, we will use the formula: Vav = S / t = (S1 + S3) / (t1 + t2 + t3) = (V1 * t1 + V3 * t3) / (t1 + t2 + t3).
Variable values: V1 – first speed (V1 = 15 km / h); t1 – the first time of movement (t1 = 2 h); V3 – last speed (V3 = 40 km / h); t3 – last time of movement (t3 = 3 hours); t2 – stop duration (t2 = 1 hour).
Let’s calculate: Vav = (15 * 2 + 40 * 3) / (2 + 1 + 3) = 25 km / h.
Answer: The average speed is 25 km / h.
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