College

A ball has a mass of 140 g. What is the force needed to accelerate the ball at [tex]$25 \, \text{m/s}^2$[/tex]?

(Formula: [tex]F = ma[/tex])

A. 3.5 N
B. 115 N
C. 165 N
D. 4.5 N

Answer :

First, we note that the mass of the ball is given in grams and needs to be converted to kilograms. Since

[tex]$$ 1\,\text{kg} = 1000\,\text{g}, $$[/tex]

the mass in kilograms is

[tex]$$ m = \frac{140\,\text{g}}{1000} = 0.14\,\text{kg}. $$[/tex]

Next, the acceleration is given as

[tex]$$ a = 25\,\text{m/s}^2. $$[/tex]

The force needed is calculated using Newton's second law:

[tex]$$ F = ma. $$[/tex]

Substitute the values:

[tex]$$ F = 0.14\,\text{kg} \times 25\,\text{m/s}^2 = 3.5\,\text{N}. $$[/tex]

Thus, the answer is [tex]$3.5\,\text{N}$[/tex].