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You and your friends are doing physics experiments on a frozen pond that serves as a frictionless, horizontal surface. Sam, with mass 80.0 $\mathrm{kg}$ , is given a push and slides eastward. Abigail, with mass 50.0 $\mathrm{kg}$ , is sent sliding northward. They collide, and after the collision Sam is moving at $37.0^{\circ}$ north of east with a speed of 6.00 $\mathrm{m} / \mathrm{s}$ and Abigail is moving ar $23.0^{\circ}$ south of east with a speed of 9.00 $\mathrm{m} / \mathrm{s}$ . (a) What was the speed of each person before the collision? (b) By how much did the total kinetic energon

of the two people decrease during the collision?

(a) $2.26 \mathrm{m} / \mathrm{s}$

(b) $-639 \mathbf{J}$

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Cornell University

Rutgers, The State University of New Jersey

Simon Fraser University

Hope College

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