Question

A track runner, with a mass of 77.0 kg, slides on the ground after tripping and falling. At the start of the slide, the runner moves at a speed of 4.20 m/s before coming to rest. The coefficient of friction between the runner and the ground is 0.700. (a)Find the change in mechanical energy of the runner (in J) from the start of the slide to when she comes to rest. (b) How far (in m) does the runner slide?

Name: a track runner with a mass of 770 kg slides on the ground after tripping and falling at the start of the slide the runner moves at a speed of 420 ms before coming to rest the coefficient of 26172
Uploaded: 2023-03-14T10:42:49-08:00
Duration: 2 min 17 s
Channel: Sri K
Description: a track runner with a mass of 770 kg slides on the ground after tripping and falling at the start of the slide the runner moves at a speed of 420 ms before coming to rest the coefficient of 26172

          A track runner, with a mass of 77.0 kg, slides on the ground after tripping and falling. At the start of the slide, the runner moves at a speed of 4.20 m/s before coming to rest. The coefficient of friction between the runner and the ground is 0.700.
(a)Find the change in mechanical energy of the runner (in J) from the start of the slide to when she comes to rest.
(b) How far (in m) does the runner slide?

Added by Erin E.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Sri K

03/14/2023

Step 1

Since the runner is sliding on the ground, the normal force is equal to the gravitational force acting on the runner: $F_N = mg$ where $m$ is the mass of the runner and $g$ is the acceleration due to gravity (approximately $9.81 m/s^2$). Show more…

Show all steps

Thanks for your feedback!

A track runner, with a mass of 77.0 kg, slides on the ground after tripping and falling. At the start of the slide, the runner moves at a speed of 4.20 m/s before coming to rest. The coefficient of friction between the runner and the ground is 0.700. (a)Find the change in mechanical energy of the runner (in J) from the start of the slide to when she comes to rest. (b) How far (in m) does the runner slide?