---
title: "A person of mass \\(m\\) stands at rest on a digital force plate fixed to the floor of an elevator ascending at a constant speed. At time \\(t_1\\), the person rapidly bends their knees into a crouch and then immediately extends their legs to jump vertically upward. The person leaves the surface of the plate at time \\(t_2\\) and remains airborne until time \\(t_3\\). Which of the following graphs best represents the normal force \\(F_N\\) exerted by the plate on the person as a function of time \\(t\\) from \\(t = 0\\) to \\(t = t_3\\)?"
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url: "https://nerd-notes.com/ubq/124034/"
date_modified: "2026-09-28T13:30:14+00:00"
---

# A person of mass \(m\) stands at rest on a digital force plate fixed to the floor of an elevator ascending at a constant speed. At time \(t_1\), the person rapidly bends their knees into a crouch and then immediately extends their legs to jump vertically upward. The person leaves the surface of the plate at time \(t_2\) and remains airborne until time \(t_3\). Which of the following graphs best represents the normal force \(F_N\) exerted by the plate on the person as a function of time \(t\) from \(t = 0\) to \(t = t_3\)?

A person of mass \(m\) stands at rest on a digital force plate fixed to the floor of an elevator ascending at a constant speed. At time \(t_1\), the person rapidly bends their knees into a crouch and then immediately extends their legs to jump vertically upward. The person leaves the surface of the plate at time \(t_2\) and remains airborne until time \(t_3\). Which of the following graphs best represents the normal force \(F_N\) exerted by the plate on the person as a function of time \(t\) from \(t = 0\) to \(t = t_3\)?

- **A.** Graph A
- **B.** Graph B
- **C.** Graph C
- **D.** Graph D

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/124034/*