A car speeds up from 5 m/s to 12 m/s in 20 seconds. What is the
acceleration of the car?
O
A. 29 m/s2
O
B. 0.35 m/s2
C. 2.1 m/s2
O D. 11 m/s2
O
O

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.