An image formed by a mirror is virtual, upright, the same size as the object, and the same distance from the mirror as the object. which mirror produced the image?
a. flat mirror
b. concave mirror
c. convex mirror
d. spherical mirror

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?