A particle A of mass 2.5kg is released from rest from the top of a smooth plane, which makes an angle of sin⁻¹ 0.2 with the horizontal. The particle A collides 2 seconds later with a particle B, of mass 3 kg, which is moving up a line of greatest slope of the plane. The speed of B immediately before the collision is 3.5 ms⁻¹. Immediately after the collision, B has a velocity of 0.5 ms⁻¹ down the plane. Find the distance A moves up the plane after the collision.