A 3 ton Toyota land cruiser travelled at a speed of 45m/s, collides with a 2 ton comfort taxi which was parked in front of the traffic lights intersection. After the collision, both cars lock together and move off in one direction. Determine
أ) السرعة بعد الاصطدام
ب) إذا كان هذا التصادم مرناً أو غير مرن.