Two cars A and B are moving along a straight road in the same direction with velocities of 25km/h and 30km/h , respectively. Find the velocity of car B relative to car A

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

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 an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.