Question

When a train comes to rest, then the acceleration is

• A. Positive
• B. Negative
• C. Maximum
• D. Minimum

Hint:

• Increasing speed $\rightarrow$ Positive acceleration.
• Decreasing speed $\rightarrow$ Negative acceleration (retardation).
• Constant speed $\rightarrow$ Zero acceleration.

Answer 1

The Correct Option is B

Concept: Acceleration is the rate of change of velocity. When the velocity of a moving object decreases with time, the acceleration is called negative acceleration or retardation.

Step 1: Understand the motion.
A train coming to rest means its velocity decreases continuously until it becomes zero.

Step 2: Determine the sign of acceleration.
Since the velocity is decreasing, \[ \boxed{\text{Acceleration}<0.} \] Hence, the acceleration is negative.

Step 3: Final conclusion.
Therefore, the correct answer is \[ \boxed{\text{Negative}.} \]