At a city park, a person throws some bread into a duck pond. Two 4.00-kg ducks and a 9.00-kg goose paddle rapidlytoward the bread, as shown in our sketch. If the ducks swim at 1.10 m>s, and the goose swims with a speed of 1.30 m>s,find the magnitude and direction of the total momentum of the three birds.

3. Bob and Linda are sweethearts that enjoy skating arm in arm. Bob has a mass of 85 kg and Linda has a mass of 60 kg. Initially they are skating together with a speed of 3.0 m/s. Then Bob whispers a dirty joke into Linda's ear, causing her to push him in the oppposite direction of their motion. If Bob's final speed is 1.0 m/s, what is Linda's final speed? Before: Vi After: VBÍ

A rock (rock 1) is flying in the sky towards another rock, rock 2. Rock 1 has a mass of 60 kg, and Rock 2 has a mass of 10 kg. Rock 1 is in the sky with a speed of 25 m/s towards Rock 2, and rock 2 is movingtowards Rock 1 in the opposite direction with a speed of 35 m/s. If the two rocks stick together, what is their final velocity? Ignore air resistance and gravity. Is there a change in the kinetic energy of the system? If so, what is it?

Squids are the fastest marine invertebrates, using a powerful set of muscles to take in and then eject water in a form of jet propulsion that can propel them to speeds of over 11.5 m/s. What speed (in m/s) would a stationary 1.40 kg squid achieve by ejecting 0.115 kg of water (not included in the squid's mass) at 3.75 m/s? Neglect other forces, including the drag force on the squid.

After a 70-kg person steps from a boat onto the shore, the boat moves away with a speed of 0.70 m/sm/s with respect to the shore. If the same person steps from the shore onto the boat, the person and the boat move away from the shore at a speed of 0.50 m/sm/s. Assume that the initial speed of the person with respect to the shore is the same in both cases and that the person is moving in a horizontal direction. A. Determine the mass of the boat. B. Determine the speed of the person.

You’ve probably seen cartoons in which a person is blown backward by a sneeze. Could this actually happen? Suppose a 80 kg woman sneezes rather violently while standing motionless on a frictionless surface, ejecting 3.0 g of air and water vapor at a speed of 40 m/s . These are typical values for a sneeze. - If the air is ejected horizontally, how fast is the woman moving after the sneeze?

A 1200 kg car approaches a 950 kg car that is stopped at a traffic light. The initial speed of the first car is 40 mph, to the right, and it hits the second car. Both stay together moving at the same speed. What final speed do both have? 20 m/s 50 m/s 10 m/s 30 m/s