A particle P starts from rest at a point O and moves in a straight line. P has acceleration 0.6t m s⁻² at time t seconds after leaving O, until t = 10.

1. Find the velocity and displacement from O of P when t = 10.

\(After t = 10, P has acceleration −0.4t m s⁻² until it comes to rest at a point A.\)

2. Find the distance OA.