UBC ENGINEERING: A smooth track is made of straight sections a b c d as shown. Two blocks P and Q can slide with negligible friction even over the "kinks" at b and c. Block P starts from rest at a point _ m from b along the slope "ba." It slides down, strikes Q and sticks to it, and the combination slides along "be" and up "cd." How far (along "cd") from c does it climb? Derive an expression for this distance. P has a mass of III pkg and Q has a mass of 171 () kg? d a P Q 300 450 (level) C