Final answer:
A force of 15 newtons is required to accelerate an object with a mass of 3 kg at 5 m/s^2 according to Newton's second law of motion.
Step-by-step explanation:
To find the force required to accelerate an object with a mass of 3 kg at 5 m/s2, we use Newton's second law of motion, which states that the force exerted on an object is equal to its mass multiplied by its acceleration (F = m * a).
For the given mass of 3 kg and acceleration of 5 m/s2, the force is calculated as follows:
F = m * a = 3 kg * 5 m/s2 = 15 N
Therefore, a force of 15 newtons is required to achieve the specified acceleration.