Suppose two clowns on skateboards are standing motionless on a smooth surface 2.0 m apart. Clown B tosses a 5.0 kg medicine ball to Clown A. After the throw the medicine ball is traveling with a speed of 10 m/s. What is the resulting velocity of Clown B after throwing the ball? *Indicate which direction is positive.

In an experiment on the transport of nutrients in the root structure of a plant, two radioactive nuclides x and y are used. initially 2.20 times more nuclei of type x are present than of type y. just three days later there are 4.55 times more nuclei of type x than of type y. isotope y has a half-life of 1.60 d. what is the half-life of isotope x?