Answer :
We start with Newton's second law, which states
$$
F = m \times a.
$$
1. The mass is given as 140 g. Since mass must be in kilograms (kg) for this formula, we convert the mass:
$$
m = \frac{140 \text{ g}}{1000} = 0.14 \text{ kg}.
$$
2. The acceleration is given as
$$
a = 25 \text{ m/s}^2.
$$
3. Now substitute the mass and acceleration into the formula:
$$
F = 0.14 \text{ kg} \times 25 \text{ m/s}^2 = 3.5 \text{ N}.
$$
Thus, the force needed to accelerate the ball is $\boxed{3.5 \text{ N}}$.
$$
F = m \times a.
$$
1. The mass is given as 140 g. Since mass must be in kilograms (kg) for this formula, we convert the mass:
$$
m = \frac{140 \text{ g}}{1000} = 0.14 \text{ kg}.
$$
2. The acceleration is given as
$$
a = 25 \text{ m/s}^2.
$$
3. Now substitute the mass and acceleration into the formula:
$$
F = 0.14 \text{ kg} \times 25 \text{ m/s}^2 = 3.5 \text{ N}.
$$
Thus, the force needed to accelerate the ball is $\boxed{3.5 \text{ N}}$.
