Print Calculator Periodic Table Question 4 of 10 Map pling A system of four part

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Print Calculator Periodic Table Question 4 of 10 Map pling A system of four particles moves along one dimension. The center of mass of the system is at rest, and the particles do not interact with any objects outside of the system. Find the velocity, v4, of particle 4 at 3.07 s, given the following details for the motion of particles 1, 2 and 3: Particle 1 m1 2.05 kg, vi (0- (5.65 m/s) (0.277 m/s x t Particle 2: m 2.57 kg, y,( (9.15 m/s 0.651 m/s X t Particle 3 m, 4.37 kg, v3 (8.09 m/s) (0405 m X t Particle 4: m4 4.79 kg, Number m/s A Previous Check Answer Next Ext O Hint

Explanation / Answer

Velocity of centre of mass of the system, vcm = (m1v1 + m2v2 + m3v3 + m4v4) / (m1 + m2 + m3 + m4) = 0

=> v4 = -(m1v1 + m2v2 + m3v3) / m4

At t = 3.07 s,

v1 = 5.65 + (0.277 * 3.07) = 6.50 m/s

v2 = 9.15 + (0.651 * 3.07) = 11.15 m/s

v3 = 8.09 + (0.405 * 3.07) = 9.33 m/s

So, v4 = -(2.05*6.50 + 2.57*11.15 + 4.37*9.33) / 4.79 = -17.28 m/s

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