Question #b3986

1 Answer
Sep 20, 2017

Answer:

See below......

Explanation:

Distance between #hati+hatj# and #-hati+2hatj# is #(1-(-1))hati+(1-2)hatj# is equal to #2hati-hatj#
We know work done =force . displacement[it is a dot product]
Hence,work done is
#{(3hati+2hatj).(2hati-hatj)}=6-2=4j#
It's the answer...