3. A car travelling at 20. m/s stops in a distance of 40. m. What is its acceleration in m/s^2? (Please pay attention to direction and do not include
units in your answer.)

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

If a simple machine reduces the strength of a force, what must be increased?

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)