Final answer:
To calculate the velocity of the crate after 3 seconds, consider the forces acting on the crate. Use Newton's second law to determine the net force and acceleration. Then, use the equation vf = vi + at to find the final velocity.
Step-by-step explanation:
To calculate the velocity of the crate after 3 seconds, we need to consider the forces acting on the crate. The initial velocity is zero, so there is no initial kinetic energy. The crate is being pushed with a constant force of 1,018 Newtons. The coefficient of kinetic friction is 0.02.
First, we need to calculate the acceleration of the crate using Newton's second law: F_net = ma. The net force is the applied force minus the force of friction. The force of friction can be calculated using the equation F_friction = coefficient of kinetic friction * normal force. In this case, the normal force is equal to the weight of the crate, which is mg.
Next, we can use the equation vf = vi + at to calculate the final velocity of the crate after 3 seconds. The initial velocity vi is zero, the acceleration a is calculated in the previous step, and the time t is 3 seconds.