Which of the following best explains velocity?
a. the speed of an object in motion
b. the speed and direction of an object in motion
c. only the change of direction of an object in motion
d. the direction of an object in motion

In science and physics what is the standard unit of measure for speed?

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600