Final answer:
The change in speed of a 40 kg object when a constant force of 20 N is exerted for 10 s would be 5 m/s, using Newton's second law of motion.
Step-by-step explanation:
The change in speed of a 40 kg object when a constant force of 20 N is exerted for 10 s can be calculated using Newton's second law of motion. We can find the acceleration by using the formula acceleration (a) = Force (F) / mass (m). Once we have acceleration, we use the formula change in speed (Δv) = acceleration (a) × time (t) to find the change in speed.
To solve the problem:
1. Calculate the acceleration:
a = F/m = 20 N / 40 kg = 0.5 m/s².
2. Calculate the change in speed:
Δv = a × t = 0.5 m/s² × 10 s = 5 m/s. Therefore, the change in speed of the object will be 5 m/s.