Multiple choice (chose the best one only) 1. During a friendly snowball fight, two snowballs, each of mass 0.15 kg, collide in midair in a completely inelastic collision. Just before the collision, both balls are travelling horizontally, one ball with a velocity of 22 m/s [N] and the other 22 m/s [S]. What is the velocity of each ball after the collision? a) 0m/s b) 1 m/s c) 2 m/s d) 3 m/s 2. A 38-kg child is standing on a 43-kg raft that is drifting with a velocity of 1.1 m/s [N] relative to the water. The child then walks on the raft with a net velocity of 0.71 m/s [E] relative to the water. Fluid friction between the raft and water is negligible. Determine the magnitude of the resulting velocity of the raft relative to the water. a) 2.1 m/s b) 2.2 m/s c) 2.3 m/s d) 2.4 m/s 3. Two balls collide in a perfectly elastic collision. Ball 1 has mass 3.5 kg and is initially travelling at a velocity of 5.4 m/s [right]. It collides head-on with stationary ball 2 with mass 4.8 kg. The final speed of ball 2 is. a) 4.2 m/s b) 4.4 m/s c) 4.6 m/s d) 4.8 m/s 4. A stack of dinner plates on a kitchen counter is accelerating horizontally at 2.7 m/s2. Determine the smallest coefficient of static friction between the dinner plates that will prevent slippage. a) 0.24 b) 0.26 C) 0.28 d) 0.30 5. A hockey player of mass 97 kg skating with a velocity of 9.2 m/s [S] collides head-on with a defence player of mass 105 kg travelling with a velocity of 6.5 m/s [N]. An instant after impact, the two skate together in the same direction. Calculate the final speed of the two hockey players. a) 0.8 m/s b) 1.0 m/s c) 1.2 m/s d) 1.4 m/s