← Back to full paperNext question

Question 1

From Physics HL Paper 2 (May 2025, TZ1)

Grade your answerAnswer this question in practice mode and submit it for feedback.Practice under timed constraintsOpen the paper flow with timed full-exam navigation.
View source PDF page 3
  1. (a) A car of mass 1600 kg accelerates from rest.
    The graph shows how the resultant force F acting in the direction of motion of the car varies with the distance d travelled by the car.
Graph showing resultant force F (in 10^3 N) on the y-axis and distance d (in m) on the x-axis. The force is constant at 3.0 from d=0 to d=60, then decreases linearly to 0 at d=100.
Graph showing resultant force F (in 10^3 N) on the y-axis and distance d (in m) on the x-axis. The force is constant at 3.0 from d=0 to d=60, then decreases linearly to 0 at d=100.

(i) State what is represented by the area under the graph. [1]

(ii) Calculate the final speed of the car. [2]

(Question 1 continued)
A different car travels on a horizontal road at a constant speed of 45 ms⁻¹. The engine of the car develops a power of 140 kW. The resistive force F_d acting on the car is given by
F_d = cv²
where v is the speed of the car and c is a constant.

(b) Determine c. State the fundamental SI unit for your answer. [3]

Textbook topics in this question

Review the exact course sections assessed by each question part.

Mixed-topic question
1(a)(i)3.1 Work as Energy Transfer
1(a)(ii)3.2 Net Work and Kinetic Energy
1(b)3.5 Power, Efficiency, and Energy-Transfer Diagrams1.4 Projectile Motion and Fluid Resistance