According to Newton's second law of motion, the acceleration (a) of an object is directly proportional to the net force (F) applied on it and inversely proportional to its mass (m). The relationship can be expressed by the equation:
\[ a = \frac{F}{m} \]
In the first trial, if a net force of 0.7 N is applied, the acceleration will be:
\[ a_1 = \frac{0.7 , \text{N}}{m} \]
In the second trial, if half of the net force is applied (which would be 0.35 N), the acceleration becomes:
\[ a_2 = \frac{0.35 , \text{N}}{m} \]
Since \(0.35, \text{N}\) is half of \(0.7, \text{N}\), the new acceleration \(a_2\) will be half of the original acceleration \(a_1\).
Therefore, the correct response is:
The acceleration is half of its original value.