The motorcyclist drove 10 km in 20 minutes, and then another 10 minutes moved

| April 18, 2021 | education

The motorcyclist drove 10 km in 20 minutes, and then another 10 minutes moved at a speed of 36 km / h. Determine the average speed of the motorcyclist.

Given:

S1 = 10 kilometers = 10,000 meters – the length of the first section of the route;

t1 = 20 minutes = 1200 seconds – the time during which the motorcyclist covered the first section of the path;

v2 = 36 km / h = 10 m / s – the speed of the motorcyclist on the second section of the path;

t2 = 10 minutes = 600 seconds – the time during which the motorcyclist covered the second section of the path.

It is required to determine v (cf) – the average speed of the motorcyclist.

Let’s find the entire path that the motorcyclist traveled:

S = S1 + S2 = S1 + v2 * t2 = 10000 + 10 * 600 = 10000 + 6000 = 16000 meters.

Let’s find the total time of movement:

t = t1 + t2 = 1200 + 600 = 1800 seconds.

Then the average speed will be equal to:

v (sr) = S / t = 16000/1800 = 8.9 m / s.

Answer: The average speed of a motorcyclist is 8.9 m / s.



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