A sky-diver leaps from a hot-air balloon that is 4000 m above the ground. At time = 30 s, she deploys her parachute.
Fig. 1.1 shows the speed-time graph for her descent.
(a(i))[1]
Place the letter X beside the point on the graph where the sky-diver opens her parachute.
(a(ii))[1]
Mark the two stretches of the graph where the sky-diver is moving at terminal velocity with the letters Y and Z.
(b)[4]
Describe, in terms of the forces acting on the sky-diver, how her motion changes from leaving the balloon until she opens her parachute.
(c)[2]
Calculate the average speed of the sky-diver in the first 4.0 s of her fall.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “X close to coordinates (30, 60)” …