1. A quadcopter is initially moving at 18 m/s north. It then accelerates at 6 m/s2 to the south for 4 s. How far does it travel during the 4 s?
2. A motorcycle starts from rest and accelerates at a rate of 10 m/s2 for 4 seconds and then accelerates at a rate of 2 m/s2 for 3 seconds. How far did the motorcycle travel in 7 s?