An object moves 10 m in 4 s then turns left and moves 20 m in next 5 s. What is the average speed of the object?

Options

A. `10 m/s`
B. `(10)/3 m/s`
C. `(20)/3 m/s`
D. `4.5 m/s`

Answer

To find the average speed of the object, we need to follow these steps:

### Step 1: Calculate the total distance traveled
The object first moves 10 meters and then turns left to move another 20 meters.

Total distance traveled (d) = distance 1 + distance 2
= 10 m + 20 m
= 30 m

### Step 2: Calculate the total time taken
The time taken for the first part of the journey is 4 seconds, and for the second part, it is 5 seconds.

Total time taken (t) = time 1 + time 2
= 4 s + 5 s
= 9 s

### Step 3: Calculate the average speed
Average speed (v) is calculated using the formula:
\[ v = \frac{d}{t} \]

Substituting the values we found:
\[ v = \frac{30 \text{ m}}{9 \text{ s}} \]
\[ v = \frac{10}{3} \text{ m/s} \]
\[ v \approx 3.33 \text{ m/s} \]

### Final Answer
The average speed of the object is approximately \( \frac{10}{3} \) m/s or 3.33 m/s.

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