1
What is the relationship between the kinetic energy of an object and its velocity and mass?
An engineer is designing a small toy car that a spring will launch from rest along a racetrack.
She wants to maximize the kinetic energy of the toy car when it launches from the end of a
compressed spring onto the track, but she can make only a slight adjustment to the initial
conditions of the car. The speed of the car just as it moves away from the spring onto the
track is called the launch speed. Which of the following modifications to the car design would
have the greatest effect on increasing the kinetic energy of the car?

A. decrease the mass of the car slightly
B. increase the mass of the car slightly
C. decrease the launch speed of the car slightly
D. increase the launch speed of the car slightly

Of course it could have been avoided. a great many scholars argue it happened because of truman's use of fear to gain support. his predecessor fdr was the most popular and charismatic president ever. truman was a machine politician chosen as the least offensive choice around for vp. had henry wallace remained vp and then president, the cold war might not have happened. or had dewey been defeated in the primaries by robert taft, and then taft defeated truman in 48, the cold war also might not have happened. taft was somewhat isolationist, opposing nato and the korean war. wallace believed truman to be unnecessarily provocative in his dealings with the soviets.of course for strong anti communists, they claim the soviets would see any sign of weakness and try to take over the world. but this is a conspiracy theory not backed by evidence. most communist movements were local and not controlled by moscow. stalin had just lost over 20 million people and was exhausted and paranoid. his number one fear was a rearmed germany allied with the us, and truman made his nightmare real with the marshall plan. truman's blunders are at least half responsible for the cold war and neither wallace nor taft would have made them.on top of that, stalin was dying and in poor health. his successor khrushchev was a reformer who ended the forced labor camps, set many political prisoners free, criticized stalin, and declined to build a powerful soviet navy to confront the us. stalin actually proposed a neutral united germany. a paranoid american gov't turned him down, guaranteeing a continued cold war for decades more.