Calculate directly the line integral 6a ds of the vector a--y + xy around the closed path in the xy plane with straight sides given by: (0, 0) (3, 0) (3,4) (0,4) (0,0). also calculate the surface integral of v x a over the enclosed area and show that (1-67) is satisfied.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be