Solve this physics exercise question

Mass of the object ($m$) = 10 kg
Initial velocity ($v_i$) = 5 m/s
Final velocity ($v_f$) = 15 m/s
Time interval ($\Delta t$) = 4 s

Acceleration ($a$) is the rate of change of velocity. The formula is:
$a = \frac{v_f - v_i}{\Delta t}$

$a = \frac{15 \, \text{m/s} - 5 \, \text{m/s}}{4 \, \text{s}}$

$a = \frac{10 \, \text{m/s}}{4 \, \text{s}}$
$a = 2.5 \, \text{m/s}^2$

According to Newton's second law of motion, the net force ($F_{net}$) is the product of mass and acceleration:
$F_{net} = m \times a$

$F_{net} = 10 \, \text{kg} \times 2.5 \, \text{m/s}^2$

$F_{net} = 25 \, \text{kg} \cdot \text{m/s}^2$
Since 1 Newton (N) is equal to 1 kg·m/s², the net force is:
$F_{net} = 25 \, \text{N}$

The net force acting on the object is 25 N.