Physical quantities expresed only by their magnitude is​

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

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