What will be the work done to stop a moving cycle of mass 30 kg which is moving with speed 54 km/hr?
W =KE =1/2mv2
=1/2 x 30 X 54 =810J
but in theSE CASE DIRECTIONOF FORCE IS OPPOSITE TO DIRECTION OF DISPLACEMENT . SO ;
W =-810J
=1/2 x 30 X 54 =810J
but in theSE CASE DIRECTIONOF FORCE IS OPPOSITE TO DIRECTION OF DISPLACEMENT . SO ;
W =-810J