Question

Part A On a frictionless horizontal air table, puck A (with mass 0.253 kg ) is moving toward puck B (with mass 0.373 kg), which is initially at rest. After the collision, puck A has velocity 0.125 m/s to the left, and puck B has velocity 0.645 m/s to the right. What was the speed Vai of puck A before the collision? View Available Hint(s) IVO ALOM ? VAi = Submit Previous Answers X Incorrect; Try Again; 6 attempts remaining Part B Calculate AK, the change in the total kinetic energy of the system that occurs during the collision. View Available Hint(s)

Answer 1

a)

using conservation of momentum

m1 u1 + m2 u2 = m1 v1 + m2 v2

0.253 u1 + 0.373* 0 = 0.253* (- 0.125) + 0.373* 0.645

u1 = 0.826 m/s

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b)

using conservation of energy

dkE = 0.5 m u1^2 - 0.5 ( m1 v1 ^2 +m2 v2^2)

dKE = 0.5* 0.253* 0.826^2 - 0.5* ( 0.253* 0.125^2 + 0.373* 0.645^2)

dKE = 6.743* 10^-3 J

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