Comic-strip hero Superman meets an asteroid in outer space, and hurls it at 710 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman. In the strip, Superman is seen at rest after the throw. Taking physics into account, what would be his recoil velocity?
A car crashes into a wall at 60 m/s and is brought to rest in 0.1 s. Calculate the average force exerted on a 80 kg test dummy by the seat belt.
Lillian (mass 44.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 4.0 m/s. What is the speed of Lillian and her dog after the catch?