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(8%) Problem 11: A runner is initially at rest at the starting line of a 100 m race. When he hears the starting gun, he accelerates at a constant rate of a; = 0.55 m/s², which he maintains until he crosses the finish line at time t = t₁. It then takes him an additional 7.5 s to come to a complete stop at time t = 12. Use the given coordinate system where x is positive to the right. Refer to the figure. V0 = 0 V₂ = 0 i n t = 0 VI t = t₁ t = t₂ Ⓒtheexpertta.com A 33% Part (a) Enter an expression for the time, t₁1, that it takes for the runner to cross the finish line in terms of d and ai. A 33% Part (b) Enter an expression for the runner's speed, v₁, when he crosses the finish line in terms of a; and t₁ only. ▷ A 33% Part (c) Calculate the runner's constant acceleration, in meters per second squared, after he crosses the finish line until he comes to rest. af = m/s² Grade Summary Deductions Potential 0% 100%

(8%) Problem 11: A runner is initially at rest at the starting line of a 100 m race. When he hears the starting gun, he accelerates at a constant rate of a; = 0.55 m/s², which he maintains until he crosses the finish line at time t = t₁. It then takes him an additional 7.5 s to come to a complete stop at time t = 12. Use the given coordinate system where x is positive to the right. Refer to the figure. V0 = 0 V₂ = 0 i n t = 0 VI t = t₁ t = t₂ Ⓒtheexpertta.com A 33% Part (a) Enter an expression for the time, t₁1, that it takes for the runner to cross the finish line in terms of d and ai. A 33% Part (b) Enter an expression for the runner's speed, v₁, when he crosses the finish line in terms of a; and t₁ only. ▷ A 33% Part (c) Calculate the runner's constant acceleration, in meters per second squared, after he crosses the finish line until he comes to rest. af = m/s² Grade Summary Deductions Potential 0% 100%

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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(8%) Problem 11: A runner is initially at rest at the starting line of a 100 m race. When he hears the starting gun, he accelerates at a constant rate of a; = 0.55 m/s², which he maintains until he crosses the finish line at time t = t₁. It then takes him an additional 7.5 s to come to a complete stop at time t = 12. Use the given coordinate system where x is positive to the right. Refer to the figure. Vo=0 V₂ = 0 i n m/s² t = 0 VI t = t₁ t = t₂ Ⓒtheexpertta.com A 33% Part (a) Enter an expression for the time, t₁1, that it takes for the runner to cross the finish line in terms of d and ai. A 33% Part (b) Enter an expression for the runner's speed, v₁, when he crosses the finish line in terms of a; and 1₁ only. ▷ A 33% Part (c) Calculate the runner's constant acceleration, in meters per second squared, after he crosses the finish line until he comes to rest. af = Grade Summary Deductions Potential 0% 100%
Transcribed Image Text:(8%) Problem 11: A runner is initially at rest at the starting line of a 100 m race. When he hears the starting gun, he accelerates at a constant rate of a; = 0.55 m/s², which he maintains until he crosses the finish line at time t = t₁. It then takes him an additional 7.5 s to come to a complete stop at time t = 12. Use the given coordinate system where x is positive to the right. Refer to the figure. Vo=0 V₂ = 0 i n m/s² t = 0 VI t = t₁ t = t₂ Ⓒtheexpertta.com A 33% Part (a) Enter an expression for the time, t₁1, that it takes for the runner to cross the finish line in terms of d and ai. A 33% Part (b) Enter an expression for the runner's speed, v₁, when he crosses the finish line in terms of a; and 1₁ only. ▷ A 33% Part (c) Calculate the runner's constant acceleration, in meters per second squared, after he crosses the finish line until he comes to rest. af = Grade Summary Deductions Potential 0% 100%
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