- A van travels with constant acceleration along a straight horizontal road.
The van passes a point \(A\) with speed \(u \mathrm {~ms} ^ { - 1 }\) and 20 seconds later passes a point \(B\) with speed \(28 \mathrm {~ms} ^ { - 1 }\)
The distance \(A B\) is 400 m .
- Show that \(u = 12\)
- Find the time taken for the van to travel from \(A\) to the midpoint of \(A B\).
The van has mass 1200 kg .
During its motion the van experiences a constant resistive force of magnitude 260 N - Find the magnitude of the driving force exerted by the engine of the van as it travels from \(A\) to \(B\).