Question

A body of mass 20 Kg is accelerated from rest and covers a distance of 25 m in 6 seconds, calculate the work done in accelerating the body.

Answer 1

Explanation:

ɢɪᴠᴇɴ ᴛʜᴀᴛ,

ᴍᴀss ᴍ=ᴋɢ

ɪɴɪᴛɪᴀʟ ᴠᴇʟᴏᴄɪᴛʏ ᴜ=ᴍ/s

ғɪɴᴀʟ ᴠᴇʟᴏᴄɪᴛʏ ᴠ=ᴍ/s

ᴛɪᴍᴇ ᴛ=s

ɴᴏᴡ, ᴛʜᴇ ᴀᴄᴄᴇʟᴇʀᴀᴛɪᴏɴ ɪs

ᴠ=ᴜ+ᴀᴛ

ᴀ=

ᴛ

ᴠ−ᴜ

ᴀ=

ᴀ=ᴍ/s

ɴᴏᴡ, ᴛʜᴇ ғᴏʀᴄᴇ ɪs

ғ=ᴍᴀ

ғ=×

ғ=ɴ

ɴᴏᴡ, ᴛʜᴇ ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ ɪs

s=ᴜᴛ+

ᴀᴛ

s=+

××

s=ᴍ

ɴᴏᴡ, ᴛʜᴇ ᴡᴏʀᴋ ᴅᴏɴᴇ ɪs

ᴡ=ғ⋅s

ᴡ=×

ᴡ=ᴊ

ɴᴏᴡ, ᴛʜᴇ ᴘᴏᴡᴇʀ ɪs

ᴘ=

ᴛ

ᴡ

ᴘ=

ᴘ=ᴡᴀᴛᴛ

ʜᴇɴᴄᴇ, ᴛʜᴇ ᴘᴏᴡᴇʀ ɪs ᴡᴀᴛᴛ

Answer 2

ɢɪᴠᴇɴ ᴛʜᴀᴛ,

ᴍᴀss ᴍ=ᴋɢ

ɪɴɪᴛɪᴀʟ ᴠᴇʟᴏᴄɪᴛʏ ᴜ=ᴍ/s

ғɪɴᴀʟ ᴠᴇʟᴏᴄɪᴛʏ ᴠ=ᴍ/s

ᴛɪᴍᴇ ᴛ=s

ɴᴏᴡ, ᴛʜᴇ ᴀᴄᴄᴇʟᴇʀᴀᴛɪᴏɴ ɪs

ᴠ=ᴜ+ᴀᴛ

ᴀ=

ᴛ

ᴠ−ᴜ

ᴀ=

ᴀ=ᴍ/s

ɴᴏᴡ, ᴛʜᴇ ғᴏʀᴄᴇ ɪs

ғ=ᴍᴀ

ғ=×

ғ=ɴ

ɴᴏᴡ, ᴛʜᴇ ᴅɪsᴘʟᴀᴄᴇᴍᴇɴᴛ ɪs

s=ᴜᴛ+

ᴀᴛ

s=+

××

s=ᴍ

ɴᴏᴡ, ᴛʜᴇ ᴡᴏʀᴋ ᴅᴏɴᴇ ɪs

ᴡ=ғ⋅s

ᴡ=×

ᴡ=ᴊ

ɴᴏᴡ, ᴛʜᴇ ᴘᴏᴡᴇʀ ɪs

ᴘ=

ᴛ

ᴡ

ᴘ=

ᴘ=ᴡᴀᴛᴛ

ʜᴇɴᴄᴇ, ᴛʜᴇ ᴘᴏᴡᴇʀ ɪs ᴡᴀᴛᴛ