A projectile is launched at 60 degrees to the horizontal. From launch to landing back down takes 4s. How far does it go horizontally?

Which launch angle causes the ball to travel further horizontally before hitting the ground?

As mentioned above, the sine function reaches its biggest output value, 1, with an input angle of 90 degrees, so we can see that for a sky-high punt θ = 90. That means that the best way to launch a high-altitude projectile is to send it flying at a 90-degree angle to the ground—straight up

Explanation:

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.