8 A Coal Car Of Mass 2m Is Sitting At Rest On A Train Track Another Train Of Mass 4m Is Coasting On Level Ground With 1 (566.21 KiB) Viewed 32 times
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8. A coal car of mass 2m is sitting at rest on a train track. Another train of mass 4m is coasting on level ground with a speed v. This moving train collides with the parked coal car and they all continue joined together coasting down the track. What percentage of the kinetic energy is lost in the collision? a. 0% M₁ = 2m b. 33 % v₁ = 0m/s C 66% d. 100 % 9. A driveshaft completes 2300 rotations every 20.0 seconds. What is its angular velocity? a. 1150 rpm (6) 2300 rpm 4600 rpm C. d. 6900 rpm
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