Question

Find the work done in moving an object along a vector r=3i+2j-5k, if the applied force is F=2i-j-k

Answer 1

9 ..................

Answer 2

Find the work done in moving an object along a vector r=3i+2j-5k, if the applied force is F=2i-j-k

A=Fr=(3i-2j-5k)(2i+j-k)

=3*2+(-2)*1+(-5)*(-1)

=6-2+5

=9

Regards!