2. You place a 6m long plank of wood (mass = 60kg) on two supports. One support is placed at one end and the second is placed 4.0m from that end. Your little brother (m=30kg) starts walking along the plank starting from the end with the support. How far past the second support can he walk before the plank just starts to fall?

3. You roll a basketball (m=0.625kg and diameter of 22.86cm) along the floor at 6.7m/s toward an incline of 35-degrees. How far up the incline does the basketball roll before it changes direction and rolls down?