# How do you put force in a projectile equation

Hi. I need to put the formula F=ma into the projectile formula
displacement =(initial velocity)time+acceleration(time2)/2

I've already tried it but can't. Please help me
Thanks.

## Answers and Replies

berkeman
Mentor
Hi. I need to put the formula F=ma into the projectile formula
displacement =(initial velocity)time+acceleration(time2)/2

I've already tried it but can't. Please help me
Thanks.

Welcome to the PF.

Sure you can. The "a" in your first equation is the "acceleration" in your second equation.

Welcome to the PF.

Sure you can. The "a" in your first equation is the "acceleration" in your second equation.
That acceleration is from gravity and I want to know the force taken to throw an object

berkeman
Mentor
That acceleration is from gravity and I want to know the force taken to throw an object

So you write equations in both the x and y directions. Depending on the angle that the projectile is thrown, it may have both x and y components of acceleration that give the projectile initial velocity in the x and y directions. After that, only the acceleration of gravity affects the projectile in the y direction (assuming no air resistance effects).