The shape of a projectiles trajectory is called an ellipse

ANSWER:

The shape of a projectiles trajectory is not called an ellipse,it is parabolic.

EXPLANATION:

Projectile motion is a kind of motion where an object moves in a bilaterally well-formed, parabolic path. The path that the object follows is called its trajectory. Projectile motion only occurs when there is one force implemented at the start on the trajectory, after which the only restraint is, from the gravity.When we look at the shape of trajectory it forms a parabolic shape as discussed above.

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.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this