A man is standing on a sparing platform, Reading of spring balaance is `60kg` wt If man jumps outside the platform then the reading of the spring balance .

Options

A. Becomes `gt60 kg` wt initially and then decrease to zero
B. Becomes `llt60 kg` wt first and then decreases to zero
C. Becomes =60 kg wt fist and then decrease to zero
D. Remains decreasing till zero

Explanation

To solve the problem, we need to analyze the situation step by step.

### Step 1: Understand the Initial Condition
Initially, the man is standing on the spring platform, and the spring balance reads 60 kg. This means the weight of the man is equivalent to 60 kg.

**Hint:** Remember that the reading on the spring balance indicates the force exerted by the man due to gravity, which is his weight.

### Step 2: Analyze the Jump
When the man decides to jump off the platform, he exerts a force on the platform to propel himself upwards. This force is greater than his weight momentarily because he needs to overcome the gravitational force acting on him.

**Hint:** Consider the forces acting on the man and the platform when the man jumps. The force exerted by the man on the platform will be greater than his weight for a brief moment.

### Step 3: Effect on the Spring Balance
As the man jumps, the spring balance will initially register a reading greater than 60 kg due to the additional force he applies to jump. This is because the force exerted on the spring balance includes both his weight and the extra force needed to jump.

**Hint:** Think about how the spring balance measures the total force acting on it. When the man jumps, he applies an upward force which temporarily increases the reading.

### Step 4: Reading After the Jump
After the man has jumped off the platform, there will be no weight acting on the spring balance anymore. Therefore, the reading will drop to zero.

**Hint:** Consider what happens to the forces once the man is no longer in contact with the platform.

### Conclusion
The reading of the spring balance will first become greater than 60 kg when the man jumps and then will decrease to zero once he is no longer on the platform.

### Final Answer
The reading of the spring balance will first exceed 60 kg and then drop to 0 kg after the man jumps off.

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