which of the following is true about kinetic energy select all that apply
A as an objects speed increases kinetic energy decreases
B only moving objects have kinetic energy •••
C kinetic energy increases as an objects height increases
D kinetic energy depends on an objects mass •••
B & D look good to me
The correct answers are:
B) Only moving objects have kinetic energy.
D) Kinetic energy depends on an object's mass.
The correct answers are B: only moving objects have kinetic energy, and D: kinetic energy depends on an object's mass.
Explanation:
Kinetic energy is the energy possessed by an object due to its motion. Let's go through each option and determine whether it is true or false:
A: As an object's speed increases, kinetic energy decreases. This statement is false. According to the kinetic energy formula, KE = 1/2 * mv^2 (where KE is the kinetic energy, m is the mass of the object, and v is the velocity or speed of the object), an increase in speed would actually result in an increase in kinetic energy.
B: Only moving objects have kinetic energy. This statement is true. Kinetic energy is associated with the motion of an object. If an object is not moving, it does not have any kinetic energy.
C: Kinetic energy increases as an object's height increases. This statement is false. The increase in height of an object does not directly affect its kinetic energy. Kinetic energy is dependent on the object's speed and mass, rather than its height.
D: Kinetic energy depends on an object's mass. This statement is true. According to the kinetic energy formula mentioned earlier, kinetic energy is directly proportional to an object's mass. The greater the mass of an object, the greater its kinetic energy will be if it is moving with the same speed.
Therefore, the correct answers are B (only moving objects have kinetic energy) and D (kinetic energy depends on an object's mass).