28.0 m/s. A 0.140 kg baseball is thrown with a velocity of
It is
struck with an average force of 5000.0 N,
which results in a
velocity of
37.0 m/s
in the opposite direction. How long were the
bat and ball in contact?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.