Question

explain the displacement perpendicular to the direction of force is zero....

Answer 1

HEÝ here is ùr answer...As displacement is the shortest distance travelled from the initial to final position in a particular direction .... that's why displacement perpendicular.i.e.from initial to final position when it covers the distance into the direction of force it will be zero.Hope it helps ù☺!!!

Answer 2

as we know that work is a dot product of vector F and Vector d( displacement) .
So W=Fd cos(thetha)
if thetha= 90.
then cos(90)= 0.
so work done will be zero!!!!!...