4 A particle moves downwards on a smooth plane inclined at an angle \(\alpha\) to the horizontal. The particle passes through the point \(P\) with speed \(u \mathrm {~ms} ^ { - 1 }\). The particle travels 2 m during the first 0.8 s after passing through \(P\), then a further 6 m in the next 1.2 s . Find

1. the value of \(u\) and the acceleration of the particle,
2. the value of \(\alpha\) in degrees.