Question

7. A train takes 2h to reach station B from station A, and
then 3h to return from station B to station A. The
distance between the two stations is 200 km. Find :
(i) the average speed, (ii) the average velocity of the
train.​

Answer 1

$\huge\sf\mathbb\color{red}\underline{\colorbox{black}{︎✪AɴSᴡᴇʀ ✪︎}}$

ᴛᴏᴛᴀʟ ᴅɪsᴛᴀɴᴄᴇ ↴

• ᴅ ⇢ 200+200 ⇢ 400ᴋᴍ

$\bold\purple{ ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ | ᴠₐᵥᵍ| = ᴛᴏᴛᴀʟ ᴅɪsᴛᴀɴᴄᴇ /ᴛᴏᴛᴀʟ ᴛɪᴍᴇ}$

$⇢ᴀᴠᴇʀᴀɢᴇ \: sᴘᴇᴇᴅ | ᴠₐᵥᵍ| = 400 /2+3$

ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ S⇢0

ᴀᴠᴇʀᴀɢᴇ ᴠᴇʟᴏᴄɪᴛʏ ᴠₐᵥᵍ ⇢ ᴛᴏᴛᴀʟ ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ/ ᴛᴏᴛᴀʟ ᴛɪᴍᴇ

∴ Vavg=2+30=0 ᴋᴍ/ʜ

Answer 2

speed = distance/time

= 400/5

= 80km/hr

velocity = displacement /time

= 0/5

= 0.