Question

a car covers a distance of 50 km during first hour 40 kilometre during second hour and 60 kilometre during next 2 hours of its motion along a straight road find the average speed​

Answer 1

Answer :

Given -

• Distance covered by car in 1st hour is 50 km.
• Distance covered by the car in 2nd hour is 40 km.
• Distance covered by the car in in last two hours is 60 km.

To Find -

• Average Speed ?

Solution -

First Case :

• Distance = 50 km
• Time = 1 hr

Second case :

• Distance = 40 km
• Time = 1 hr

Third case :

• Distance = 60 km
• Time = 2 hr

Now, Average Speed = Total Distance/Total Time.

Hence, Avg. Speed = (50 + 40 + 60)/(4 hr)

⇒ Avg. Speed = 150/4

⇒ Avg. Speed = 37.5 km/hr

⇒ Avg. Speed = 37.5 * 5/18

⇒ Avg. Speed = 10.41 m/s

Hence, Average Speed of the motion is 10.41 m/s.

Answer 2

Answer:

10.41 m/s

Explanation:

=total distance /total time

=(50+60+40)/(4hrs)

=150\4

=37.4 km/hrs

=5/18 km or hrs

=10.4l km/hrs