Question

6. An object is moving with 5m/s for 10 minutes and with 2 m/s for the next 5 minutes. It's average
speed is 65

3m/s
4m/s
2m/s
D 6m/s​

Answer 1

Answer:

4 m/s

Explanation:

Given :

• Speed the object travels for 10 minutes = 5 m/s

• Speed the object travels for 5 minutes = 2 m/s

To find :

• Average speed of the object

Average speed = total distance / total time

Total distance = 5×600 + 2×300

Total distance = 3000+600

Total distance = 3600 metres

Total time = 10+5 = 15 minutes = 900 seconds

Average speed = 3600/900

Average speed = 4 m/s

The average speed of the object is equal to 4 m/s

Answer 2

Answer :

Given that an object is moving with 5 m/s for 10 minutes and with 2 m/s for next 5 minutes.

We have to find average speed of object.

From the data :

Speed 1 = 5 m/s

Time 1 = 10 minutes = (10 × 60) = 600 s

We know that,

→ Distance = Speed × Time

→ Distance 1 = 5 × 600

→ Distance 1 = 3000 m

Now,

Speed 2 = 2 m/s

Time 2 = 5 minutes = (5 × 60) = 300 s

→ Distance 2 = 2 × 300

→ Distance 2 = 600 m

Now we know that,

→ Average speed = Total distance/Total time

Substituting values,

→ Av. speed = (3000 + 600)/(600 + 300)

→ Av. speed = 3600/900

→ Av. speed = 4 m/s

∴ Average speed of object = 4 m/s