Why can no material object attain the speed of light according to special relativity?
A
Its mass makes the required energy grow without limit
B
Gravity stops every object
C
Light has no direction
D
Time becomes exactly zero at low speed
Correct Answer: Option A — Its mass makes the required energy grow without limit
Explanation:
A correct analysis gives Its mass makes the required energy grow without limit when magnitude, direction, units and conditions are considere...
A correct analysis gives Its mass makes the required energy grow without limit when magnitude, direction, units and conditions are considered. The question tests whether the learner can distinguish the required quantity from related ideas and use the stated information without adding unsupported assumptions. The alternatives Gravity stops every object, Light has no direction, and Time becomes exactly zero at low speed do not satisfy the governing definition, graph interpretation, direction convention, or numerical relationship in this case. In examinations, identify the known quantities, keep SI units consistent, select a positive direction where needed, and apply the appropriate definition or equation. This also checks that the answer has a sensible magnitude and unit.