Page 04 3. The graph shows how the vertical speed of a skydiver varies with time. vertical speed P Q R S 0 time A student uses information from the graph to make the following statements. I The acceleration of the skydiver is greatest between P and Q. II The air resistance acting on the skydiver between Q and R is less than the weight of the skydiver. III The forces acting on the skydiver are balanced between R and S. Which of these statements is/are correct? A I only B II only C III only D I and II only E I , II and III 4. A spacecraft is travelling at a constant speed of 2·75 × 108 m s−1 relative to a planet. A technician on the spacecraft measures the length of the spacecraft as 125 m. An observer on the planet measures the length of the spacecraft as A 36 m B 50 m C 124 m D 314 m E 433 m.