Three steel spheres P, Q and R, each of mass 0.10 kg, slide on a smooth horizontal surface. For each sphere, the velocity changes during a 0.01 s collision with a vertical wall as listed:
P: +4 m s⁻¹ to –2 m s⁻¹
Q: +4 m s⁻¹ to +1 m s⁻¹
R: +4 m s⁻¹ to 0 m s⁻¹
Calculate the impulse delivered to each sphere (magnitude only) and list the impulses in descending order.