Acar travels in a straight line for 4.4 h at a constant speed of 81 km/h. what is its acceleration?

The speed and length of time don't matter.

Constant speed in a straight line is the DEFINITION of ZERO acceleration.

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.

c) up is the direction the magnetic force is acting on the charge.