7. A 0.4 kg toy car is subjected to a constant force of 2 N that accelerates it from 0.5 to a speed of 0.75 m/s. What is the impulse applied to the toy
car?

A. 0.1 m/s
B. 0.1 kg m/s
C. 0.25 m/s
D. 1.65 kg m/s

Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

C) the periods  of day and night would be fixed all year for anyone at the  equator