discuss the motion of centre of mass of an isolated system
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- ᴀɴ ɪꜱᴏʟᴀᴛᴇᴅ ꜱʏꜱᴛᴇᴍ ɪꜱ ᴀ ꜱʏꜱᴛᴇᴍ ᴡʜɪᴄʜ ᴅᴏᴇꜱ ɴᴏᴛ ᴇxᴘᴇʀɪᴇɴᴄᴇ ᴀɴʏ ᴇxᴛᴇʀɴᴀʟ ꜰᴏʀᴄᴇ. ɪɴ ᴛʜᴇ ᴀʙꜱᴇɴᴄᴇ ᴏꜰ ᴇxᴛᴇʀɴᴀʟ ꜰᴏʀᴄᴇ, ᴛʜᴇ ᴄᴇɴᴛʀᴇ ᴏꜰ ᴍᴀꜱꜱ ᴍᴏᴠᴇꜱ ᴡɪᴛʜ ᴀ ᴄᴏɴꜱᴛᴀɴᴛ ᴠᴇʟᴏᴄɪᴛʏ. ᴛʜᴜꜱ, ᴛʜᴇ ᴍᴏᴛɪᴏɴ ᴏꜰ ᴛʜᴇ ᴄᴇɴᴛʀᴇ ᴏꜰ ᴍᴀꜱꜱ ᴏꜰ ᴀɴ ɪꜱᴏʟᴀᴛᴇᴅ ꜱʏꜱᴛᴇᴍ ɪꜱ ɪɴ ᴜɴɪꜰᴏʀᴍ ᴍᴏᴛɪᴏɴ.
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