Question

a string is used from a position 2i-j+k
metre to another position 3i+2j -2k metre under the action of force 2i+j-k N work done is

Answer 1

S1=2i-j+k
S2=3i-2j+3k
S=5i-3j+4k
F=2i+j-k
W=FS
=10-3-4
=10-7
=3J