A body is projected vertically upward direction from the surface of earth. If upward direction is taken as positive, then acceleration of body during its upward and downward journey are respectively

Options

A. Positive, negative
B. Negative, negative
C. Positive, positive
D. Negative, positive

Answer

To solve the problem, we need to analyze the motion of a body projected vertically upward from the surface of the Earth. We will determine the acceleration of the body during both its upward and downward journeys.

### Step-by-Step Solution:

1. **Understanding the Direction of Motion**:
- The body is projected upward, which we are taking as the positive direction. Thus, during the upward journey, the velocity of the body is positive.

2. **Identifying the Acceleration During Upward Motion**:
- While the body is moving upward, it is subject to the force of gravity acting downward. This gravitational force causes a deceleration (negative acceleration) as the body moves against gravity.
- Therefore, the acceleration during the upward journey is negative.

3. **Identifying the Acceleration During Downward Motion**:
- After reaching its maximum height, the body will start descending. During this downward journey, the body is again influenced by gravity, which acts downward.
- Since we have taken upward as positive, the acceleration due to gravity remains directed downward, which is also negative.
- Thus, the acceleration during the downward journey is also negative.

4. **Conclusion**:
- The acceleration of the body during its upward journey is negative, and the acceleration during its downward journey is also negative.
- Therefore, the correct answer is: **Negative (upward journey) and Negative (downward journey)**.

### Final Answer:
The acceleration of the body during its upward and downward journey are respectively: **Negative, Negative**.

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