Two boats start together and race across a 78 km wide lake and back. Boat A goes across at 78 km/h and returns at 78 km/h. Boat B goes across at 39 km/h, and its crew, realizing how far behind it is getting, returns at 117 km/h. Turnaround times are negligible, and the boat that completes the round-trip first wins (a) Which boat wins? (Or is it a tie?) A, B, or is it a tie? By how much? km (b) What is the average velocity of the winning boat? km/h
Two boats start together and race across a 78 km wide lake and back. Boat A goes across at 78 km/h and returns at 78 km/h. Boat B goes across at 39 km/h, and its crew, realizing how far behind it is getting, returns at 117 km/h. Turnaround times are negligible, and the boat that completes the round-trip first wins (a) Which boat wins? (Or is it a tie?) A, B, or is it a tie? By how much? km (b) What is the average velocity of the winning boat? km/h
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter6: Motion In Two Dimensions
Section: Chapter Questions
Problem 84A
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Two boats start together and race across a 78 km wide lake and back. Boat A goes across at 78 km/h and returns at 78 km/h. Boat B goes across at 39 km/h, and its crew, realizing how far behind it is getting, returns at 117 km/h. Turnaround times are negligible, and the boat that completes the round-trip first wins
(a) Which boat wins? (Or is it a tie?)
A, B, or is it a tie?
By how much?
km
(b) What is the average velocity of the winning boat?
km/h
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