Question

Gopi walks 30m towards his car parked 30m away from his house. He notices that he forgot the car key and returns back to his house. His total travel time is 240 s. What are his average velocity and average speed?

Answer 1

✪ᴀɴsᴡᴇʀ✪

• Average Velocity is $0\:m/s$
• Average Speed is $0.25 \:m/s$

★ᴇxᴘʟᴀɪɴᴀᴛɪᴏɴ★

☆ɢɪᴠᴇɴ☆

• Gopi walks 30m from his house to his parked car and comes back as he forgot his key.
• Total travel time is 240 sec.

☆ᴄᴀʟᴄᴜʟᴀᴛɪᴏɴ☆

Average Velocity

As he comes back to original position,

• Displacement of Gopi = 0

Thus,

• Average Velocity

$\:\:\:\:\:\:\:\:= \frac{Displacement} {Time}$

$\:\:\:\:\:\:\:\:= \frac{0} {240}$

$\:\:\:\:\:\:\:\:= 0\:m/s$

Average Speed

Here

• Total Distance$= 2\times 30 = 60\:m$

So,

• Average speed

$\:\:\:\:\:\:\:\:= \frac{Total\:Distance}{Time}$

$\:\:\:\:\:\:\:\:= \frac{60} {240}$

$\:\:\:\:\:\:\:\:= 0.25 \:m/s$