일반물리학 1 — Center of Mass and Linear Momentum: Problem 19

19 A 100 kg motorbike moves along AB at 10.0 km/h, and after some time, the motorbike turns to travel along BC at the same speed as shown in Fig. 9-36. Find (a) the change in its kinetic energy and the (b) magnitude and (c) direction (relative to +x) of the change in its momentum.