Three students ( teresa, 50.0 Kg, Sara, 60.0Kg, and Doug, 80 Kg ) decide to go r

Question

Three students ( teresa, 50.0 Kg, Sara, 60.0Kg, and Doug, 80 Kg ) decide to go roller rinking. While standing close together in a small circle, each student presses the palms of his or her hands against those of the other two students. They the simultaneously push off from each other. Doug rolls off at 0.650 m/s directly toward the seats. Sara moves away at 0.500 m/s at an angle of 110 degress counterclockwise from Doug's line of motion as shown in the figure below.

a) How fast and in what direction is Teresa pushed?

c) Find the kinetical energy of each person

please show me all steps

Explanation / Answer

b)dong magnitude p = mv

Put value

p = 80.0 X 0.650 = 52

sara magnitude p = mv

p = 60.0 X 0.500

p = 30

C) kinetic energy K.E = 1/2 mv^2

Put value

doug K.E = 1/2 (80)*(0.650)^2 = 16.9

sara K.E = 1/2 *(60)*(0.50)^2 =7.5

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