A block of mass m = 9.40 kg, moving on a horizontal frictionless surface with a speed 5.20 m/s, makes a perfectly elastic collision with a block of mass M = 19.0 kg at rest. After the collision, the 9.40 block recoils with a speed of 0.700 m/s. In the figure, the blocks are in contact for 0.200 s. a) What is the velocity of the second mass M after the collision?

b) What quantities are conserved in this collision? Explain how you know they are conserved!

c) Find the average force on the 9.40-kg block, while the two blocks are in contact.

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.