Why are the action and reaction forces described by newton’s third law of motion excluded in the free-body diagram of an object?
a. they are equal and opposite, so they cancel one another.
b. they act on different objects, so they would not appear together.
c. they are in opposite directions, so only one would appear.
d. they do not happen at the same time, so only one would appear.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

wavelength divides in half and speed stays the same.