Question

Car covers first 50 km in uniform speed of 45 km per hour and next 50 km in 90 km per hour find the average velocity of car​

Answer 1

Answer:

60 km/hr

Explanation:

Given :

• A distance of 50 km was covered with a speed of 45 km/hr

• A distance of 50 km was covered with a speed of 90 km/hr

To find :

• Average speed of the car

Average speed = total distance / total time

Total distance = 50+50 = 100 km

Time = distance / speed

Time 1 = 50/45 = 10/9

Time 2 = 50/90 = 5/9

Total time = 10/9 + 5/9 = 15/9 = 5/3

Average speed = 100/5/3

Average speed = 100/5×3

Average speed = 300/5

Average speed = 60

Average speed = 60 km/hr

The average speed of the car is equal to 60 km/hr

Answer 2

Given:

• Speed for first 50 km = 45km/h
• Speed for next 50km = 90km/h

To find:

• Average speed

Solution:

We know that

Average speed = 2V1V2/V1 + V2

Where

• V1 : First velocity
• V2 : 2nd velocity

→ Avg speed = 2(45)(90)/90 + 45

→ Avg speed = 2×45×90/135

→ Avg speed = 2 × 30

→ Average speed = 60km/h

Hence , average sped of car = 60km/h