---
title: "Mark and David are loading identical cement blocks onto David’s pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp containing frictionless rollers. Which statement is true about the work done on the block–Earth system?"
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url: "https://nerd-notes.com/ubq/90809/"
date_modified: "2026-08-18T02:39:45+00:00"
---

# Mark and David are loading identical cement blocks onto David’s pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp containing frictionless rollers. Which statement is true about the work done on the block–Earth system?

Mark and David are loading identical cement blocks onto David’s pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp containing frictionless rollers. Which statement is true about the work done on the block–Earth system?

- **A.** Mark does more work than David.
- **B.** Mark and David do the same amount of work.
- **C.** David does more work than Mark.
- **D.** None of those statements is necessarily true because the angle of the incline is unknown.
- **E.** None of those statements is necessarily true because the mass of one block is not given.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/90809/*