Question Detail
Question
What is the velocity of the object? (Given a position-time graph with points at (0,0), (4,20), (8,40))
Correct Answer
Option D is the correct answer.
Detailed Explanation
From the graph, at t=4 s, x=20 m; at t=8 s, x=40 m. The slope of the x-t graph gives velocity. Assuming constant velocity, v = Δx/Δt = (40-20)/(8-4) = 20/4 = 5 m/s. Alternatively, from t=0 to t=4, v = 20/4 = 5 m/s.
Hint
Velocity is the slope of the position-time graph.