Question

A car travels a distance A to B at a speed of 40 km/
hr and returns to A at a speed of 30 kr/hr. The
average velocity ſin kr/hr) for the whole journey is,
(1) 34.3
(2) 0 (3) 35 (4) 36.3​

Answer 1

Step-by-step explanation:

displacement =0 (return to intial position)

average velocity=0

Answer 2

Step-by-step explanation:

Given:

• A to B at a speed of 40km/hr.
• Returns to A at a speed of 30km/hr.

To Find:

• Average velocity

Solution:

As given here,

• d1= 40km
• t1= 1 hr
• d2=30km
• t2=1hr

Now as we know,

$\: \: \sf \: average \: velocity = \frac{total \: displacement}{total \: time}$

Now put the value

$\: \: \sf \: average \: velocity = \frac{40 + 30}{1 + 1} \\ \\ \: \: \sf \: average \: velocity = \frac{70}{2} \\ \\ \: \: \sf \: average \: velocity = 35 \frac{km}{hr}$

Hence,average velocity is 35km/hr.