Question

This is a gragh of a roller coaster car moving up a hill. What does the straight upward slope on the gragh show

Answer 1

A straight, upward-sloping line on a position (height) vs. time graph means the car’s height is increasing at a constant rate — i.e., it’s moving up the hill with constant velocity (no acceleration). The steeper the line, the faster it’s ascending.

(If instead the graph were velocity vs. time, an upward slope would mean the car is accelerating.)