T 3.)A car traveling at 21 m/s misses the turnoff
on the road and collides into the safety
guard rail. The car comes to a complete
stop in 0.55 s.
a. What is the average acceleration of the
car?
b. If the safety rail consisted of a section
of rigid rail, the car would stop in
0.15 s. What would be the acceleration
in this case?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

Which of these activities increases the amount of carbon in the atmosphere?

Ideal meters problem. what internal resistance is ideal for a voltmeter? what internal resistance is ideal for an ammeter?