Acceleration is defined as the rate of change for which characteristic? position time displacement velocity

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.