The kinematic equations used to calculate position and velocity at t=2.40s are the following:
Position: x = x0 + v0t + 1/2at2
Velocity: v = v0 + at
Where x0 is the initial position, v0 is the initial velocity, a is the acceleration, and t is the time.
The variables in the kinematic equations have the following meaning:
x: final position
x0: initial position
v: final velocity
v0: initial velocity
a: acceleration
t: time
The kinematic equation to use depends on what information you have and what information you are trying to find. If you know the initial and final positions, initial velocity, and acceleration, you can use the position equation. If you know the initial velocity, acceleration, and time, you can use the velocity equation.
Yes, the kinematic equations can be used for objects with constant acceleration. However, they may not accurately represent the motion of objects with non-constant acceleration.
If you have three known variables, you can rearrange the equation to solve for the missing variable. For example, if you have the initial and final positions and the acceleration, you can use the position equation to solve for the initial velocity. If you have the initial velocity, acceleration, and time, you can use the velocity equation to solve for the final velocity.