Answer:
Step-by-step explanation:
The force needed to accelerate a mass can be calculated using Newton's second law of motion:
F = ma
where F is the force, m is the mass (0.250 kg), and a is the acceleration (0.500 m/s^2). Plugging in the values, we get:
F = (0.250 kg)(0.500 m/s^2) = 0.125 N
Hence, a force of 0.125 N is needed to accelerate a 0.250-kg mass by 0.500 m/s^2.