(a)[3]
Explain why the speed changes in the way shown on the graph during the interval from $t = 0$ to $t = 26\,\text{s}$.
(b)[3]
At $t = 26\,\text{s}$, the front of the sledge is 35 m from the wall. Find the gap between the front of the sledge and the wall when the sledge comes to rest.
(c(i))[3]
Determine the magnitude of the deceleration.
(c(ii))[2]
The child has mass 46 kg and the sledge has mass 9.0 kg. Calculate the resultant force on the child and sledge while they are decelerating.
(c(iii))[2]
State the energy transfer occurring as the child and sledge decelerate.
(d)[2]
At $t = 26\,\text{s}$, when the brake is first applied, the child lurches forwards on the sledge. Explain why.