billiard ball is rolling across a pool table toward the front of a train at 2.1m/s while the train is moving forward at 6.2m/s. a.) How fast is the ball moving relative to the ground? b.) Later, the ball is rolling toward the back of the train at the same speed.  What is the ball's velocity relative to the ground now? (Train moving in the positive direction).

University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter4: Motion In Two And Three Dimensions
Section: Chapter Questions
Problem 78P: A river is moving east at 4 m/s. A boat starts from the dock heading 30 north of west at 7 m/s. If...
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A billiard ball is rolling across a pool table toward the front of a train at 2.1m/s while the train is moving forward at 6.2m/s.

a.) How fast is the ball moving relative to the ground?

b.) Later, the ball is rolling toward the back of the train at the same speed.  What is the ball's velocity relative to the ground now? (Train moving in the positive direction).

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