There are two sets of tennis balls - one set in which both tennis balls are of equal mass and one set in which both tennis balls are of double mass. In the following collisions the initial velocity of the tennis ball in motion is the same. How would the post-collision velocities of the two trials compare?

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

k2s for potassium sulphide

a. spokes of a wheel.

as indicated in the question radial contains rad, also found in radius, so the fracture's would span the radius.