When an object is moving with constant speed in a straight line, its acceleration:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. is zero.
When an object moves with constant speed in a straight line, its acceleration is zero. This is because acceleration measures the rate of change of velocity, and in this case, both the speed and direction of motion remain unchanged. Since there is no change in velocity, no net force acts on the object, according to Newton’s first law of motion. This situation represents uniform motion, where the object continues to move steadily along a straight path without speeding up or slowing down.