9. [-/2 Points] DETAILS SERCP11 6.2.P.023. MY NOTES ASK YOUR TEACHER A 45.0-kg girl is standing on a 140-kg plank. The p

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9 2 Points Details Sercp11 6 2 P 023 My Notes Ask Your Teacher A 45 0 Kg Girl Is Standing On A 140 Kg Plank The P 1 (184.78 KiB) Viewed 53 times

9. [-/2 Points] DETAILS SERCP11 6.2.P.023. MY NOTES ASK YOUR TEACHER A 45.0-kg girl is standing on a 140-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.56 m/s to the right relative to the plank. (Let the direction the girl is moving in be positive. Indicate the direction with the sign of your answer.) (a) What is her velocity relative to the surface of ice? m/s (b) What is the velocity of the plank relative to the surface of ice? m/s