Awhite pool ball of mass 1.0 kg moving at 10 m/s collides with
a 1.2 kg red pool ball initially at rest. after the collision, the
white pool ball continues in the same direction with a velocity
of 3.0 m/s. neglecting friction, the velocity of the red ball after
the collision is __m/s. (round to the nearest tenth).

i don't know that i agree with that but what's the question ?

he made 11 calls in one day

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.