Which has a larger magnitude of momentum: a 3000-kg elephant moving at 40 km/h or a 60-kg cheetah moving at 112 km/h?

Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1400 kg and was approaching at 9.00 m/s due south. The second car has a mass of 800 kg and was approaching at 22.0 m/s due west.(a) Calculate the final velocity of the cars. (Note that since both cars have an initial velocity, you cannot use the equations for conservation of momentum along the x-axis and y-axis; instead, you must look for other simplifying aspects..)Magnitude ____________ m/sDirection ____________ ° (counterclockwise from west is positive)(b) How much kinetic energy is lost in the collision? (This energy goes into deformation of the cars.) _____________ J

Betty (mass 40 kg) stands in an ice rink as Bubbles (her puppy, mass 12 kg) runs towards her and leaps into her arms. If they move off together with a speed of 0.80 m/s, how fast (in m/s) was Bubbles moving when Betty caught her?

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?