EVERYDAY SCIENCE

Detailed explanation-1: -Kinetic energy depends on the velocity of the object squared. This means that when the velocity of an object doubles, its kinetic energy quadruples.

Detailed explanation-2: -The kinetic energy is proportional to the square of the speed, so doubling the speed increases the kinetic energy by a factor of 4. However, doubling the speed does double the momentum, which we will cover in the next unit.

Detailed explanation-3: -The object’s velocity is the only variable parameter associated with the kinetic energy. If the kinetic energy of an object increases, it means the object moves faster than the original velocity. Thus, the correct option is (D) its particles moves faster.

Detailed explanation-4: -The KE is directly related to the square of the speed. If the speed is reduced by a factor of 2 (as in from 60 mi/hr to 30 mi/hr) then the KE will be reduced by a factor of 4.