Question

What was Newton 's first law of motion?

Answer 1

see there can be some more definitions and one of them is that
"if the net external force acting on a body is zero then the body is said to be unaccelerated

Answer 2

ᴀɴsᴡᴇʀ࿐

ɴᴇᴡᴛᴏɴ's ʟᴀᴡ ᴏғ ᴍᴏᴛɪᴏɴ:-

1sᴛ ʟᴀᴡ:-

ᴏʙᴊᴇᴄᴛ ɪɴ ᴍᴏᴛɪᴏɴ ᴛᴇɴᴅs ᴛᴏ sᴛᴀʏ ɪɴ ᴍᴏᴛɪᴏɴ ᴀɴᴅ ᴏʙᴊᴇᴄᴛ ᴀᴛ ʀᴇsᴛ ᴛᴇɴᴅs ᴛᴏ sᴛᴀʏ ᴀᴛ ʀᴇsᴛ ᴜɴʟᴇss ᴀᴄᴛᴇᴅ ᴜᴘᴏɴ ʙʏ ᴀɴ ᴜɴʙᴀʟᴀɴᴄᴇᴅ ғᴏʀᴄᴇ.

2ɴᴅ ʟᴀᴡ:-

ғᴏʀᴄᴇ ᴇǫᴜᴀʟ ᴍᴀss ᴛɪᴍᴇs ᴀᴄᴄᴇʟᴇʀᴀᴛɪᴏɴ(ғ= ᴍᴀ)

3ʀᴅ ʟᴀᴡ:-

ғᴏʀ ᴇᴠᴇʀʏ ᴀᴄᴛɪᴏɴ ᴛʜᴇʀᴇ ɪs ᴀɴ ᴇǫᴜᴀʟ ᴀɴᴅ ᴏᴘᴘᴏsɪᴛᴇ ʀᴇᴀᴄᴛɪᴏɴ.