Question

a car travels at 50 m/s for first 20 seconds , 30 m/s for next 30 seconds and finally 20 m/s for next 10 seconds . find its average speed

Answer 1

The average speed traveled by car is $35m/s$.

$1^{st}$ case

• Speed$=50m/s$

• Time $=20s$

       Distance $=$ $speed*time= 50*20=1000m$

$2^{nd}$ case

• Speed$=30m/s$
• Time$=30s$

       Distance$=30*30=900m$

$3^{rd}$ case

• Speed$=20m/s$
• Time$=10s$

       Distance$=20*10=200m$

Now, The total distance$=(1000+900+200)m=2100m$

        Total time$=(20+30+10)s=60s$

       Average distance $=\frac{total distance}{total time} = \frac{2100}{60}=35m/s$

To learn more about Average speed, refer to:

• brainly.com/question/21097620