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. remains same
B. decreases
C. incerases
D. first increases and then decreasses to zero

Answer

To solve the problem step-by-step, we will analyze the situation of a man standing on a spring balance and the effect of him jumping off the platform on the reading of the spring balance.

### Step 1: Understand the Initial Condition
When the man is standing on the spring balance, the reading shows `60 kg` weight. This means that the gravitational force acting on the man (his weight) is balanced by the normal force exerted by the spring balance.

**Hint:** Remember that the reading on a spring balance corresponds to the normal force exerted by the balance, which equals the weight of the man when he is at rest.

### Step 2: Analyze the Jump
When the man decides to jump off the platform, he exerts an additional force downwards on the spring balance. According to Newton's third law, for every action, there is an equal and opposite reaction. Therefore, when the man pushes down harder to jump, the spring balance will experience an increase in the normal force temporarily.

**Hint:** Consider how the force exerted by the man changes when he jumps. What happens to the normal force when he pushes down harder?

### Step 3: Effect on the Reading During the Jump
At the moment he jumps, the reading on the spring balance will momentarily increase because he is applying an extra force to the balance. This extra force is due to the acceleration he needs to achieve to jump off the platform.

**Hint:** Think about what happens to the forces when the man jumps. Does the balance register more or less force than before?

### Step 4: Normal Force After the Jump
Once the man has jumped and is no longer in contact with the spring balance, the normal force will return to zero because there is no longer any weight acting on the balance. The reading will drop back to zero immediately after he leaves the platform.

**Hint:** After the man jumps, what happens to the forces acting on the spring balance?

### Final Conclusion
1. The reading on the spring balance will initially increase when the man jumps due to the extra force he applies.
2. After the jump, the reading will drop to zero since there is no longer any weight acting on the spring balance.

Thus, the final reading of the spring balance after the man jumps off will be `0 kg`.

### Summary of Steps
1. Initial reading is `60 kg` when the man is standing still.
2. Jumping causes a temporary increase in reading due to extra force applied.
3. After the jump, the reading drops to `0 kg` as the man is no longer on the balance.