give an example of motion in which average speed is not zero, but the average velocity is zero
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(A)A car moving with an average speed returns to its original position. Hence, in this case the average speed is non-zero while the average velocity is 0. A car at rest has both average speed and average velocity zero since it covers no distance and no displacement and is stationary.
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ᴀɴsᴡᴇʀ : -
(ᴀ)ᴀ ᴄᴀʀ ᴍᴏᴠɪɴɢ ᴡɪᴛʜ ᴀɴ ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ ʀᴇᴛᴜʀɴs ᴛᴏ ɪᴛs ᴏʀɪɢɪɴᴀʟ ᴘᴏsɪᴛɪᴏɴ. ʜᴇɴᴄᴇ, ɪɴ ᴛʜɪs ᴄᴀsᴇ ᴛʜᴇ ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ ɪs ɴᴏɴ-ᴢᴇʀᴏ ᴡʜɪʟᴇ ᴛʜᴇ ᴀᴠᴇʀᴀɢᴇ ᴠᴇʟᴏᴄɪᴛʏ ɪs 0. ᴀ ᴄᴀʀ ᴀᴛ ʀᴇsᴛ ʜᴀs ʙᴏᴛʜ ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ ᴀɴᴅ ᴀᴠᴇʀᴀɢᴇ ᴠᴇʟᴏᴄɪᴛʏ ᴢᴇʀᴏ sɪɴᴄᴇ ɪᴛ ᴄᴏᴠᴇʀs ɴᴏ ᴅɪsᴛᴀɴᴄᴇ ᴀɴᴅ ɴᴏ ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ ᴀɴᴅ ɪs sᴛᴀᴛɪᴏɴᴀʀʏ.
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