Fig. 2.1 depicts an athlete going across the finishing line in a race. At the moment she crosses the finishing line, her speed is 10.0 m/s. She then reduces her speed to 4.0 m/s.
(a)[3]
Calculate the impulse acting on her as her speed falls.
(b(i))[1]
Define impulse using force and time.
(b(ii))[2]
Calculate the average resultant force acting on the athlete as her speed decreases.
(c)[2]
Calculate the force needed to produce an acceleration of 6.4 m/s$^2$ in a mass of 71 kg.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Impulse is the change in momentum” …