Two hockey pucks are sliding along the ice, towards the same goal, one directly in front of the other. The hockey puck in front has a mass of 0.170 kg, and is moving towards the goal at a speed of 6.0 m/s. The hockey puck in the rear has a mass of 0.155 kg, and is moving towards the goal at a speed of 11 m/s. After the rear puck collides with the front puck, the rear puck has a speed of 7.5 m/s. What is the speed of the front puck after the collision? 9.2 m/s 2.7
2.7 m/s
9.5 m/s
1.6 m/s
A 0.35 g BB is fired into a stationary 6.0 g ball of clay. If the BB is fired with a speed of 46 m/s, and becomes embedded in the clay ball, how fast does the clay ball move after the collision?
3.9 m/s
2.7 m/s
23 m/s
2.5 m/s
A 0.045 kg green marble collides with a stationary 0.070 kg yellow marble. Before the collision, the green marble was moving with a speed of 3.1 m/s, but after the collision, the green marble had a speed of 0.2 m/s. What was the speed of the yellow marble immediately after the collision?
2.9 m/s
0.13 m/s
1.9 m/s
2.4 m/s
Two train cars are moving towards each other. The loaded car has a mass of 134,000 kg, and is moving north at a speed of 2.9 m/s. The unloaded car has a mass of 22,600 kg, and is moving south at a speed of 0.8 m/s. When the cars collide, they lock together, and move as a single unit. What is the velocity of the cars after they join together?
2.4 m/s north
2.1 m/s north
2.1 m/s south
2.4 m/s south
Two astronauts, of mass 105 kg and 119 kg are outside their spacecraft, floating in space. They push off from one another. The 105 kg astronaut moves to the right with a speed of 1.4 m/s. What is the velocity of the 119 kilogram astronaut?
1.4 m/s to the right
1.4 m/s to the left
1.2 m/s to the right
1.2 m/s to the left
During basketball practice, two basketballs are rolling towards each other. Ball A has a velocity of 3.3 m/s east, and ball B has a velocity of 1 . 6 m/s west. Both balls have a mass of0.62 kg. If ball B has a velocity of 1 . 2 m/s east after the collision, what is the velocity of ball A after the collision?
0.5 m/s west
0.5 m/s east
3.7 m/s east
3.7 m/s west
A certain planet is impacted by a large asteroid, which sends molten rock flying into space. Two spheres of the molten rock are moving in the same direction. One sphere has a mass of 135 kg and a velocity of 95.0 m/s in the positive y-direction. The other sphere has a mass of 290 kg, and a velocity of 24.0 m/s in the positive y-direction. If the two spheres collide, and fuse together, what would be the velocity of the combined sphere?
77.4 m/s in the negative y-direction
59.5 m/s in the positive y-direction
46.6 m/s in the positive y-direction
62.2 m/s in the positive y-direction
Two row boats are on a lake. The red row boat is standing still, and has a total mass of 360 kg. The purple row boat has a mass of 440 kg, and is moving with a speed of 4.0 m/s. The purple row boat collides with the red rowboat, and after the collision, the purple rowboat is standing still. Assuming no friction, what is the velocity of the red row boat after the collision?
4.0 m/s
2.4 m/s
4.9 m/s 2.0 m/s
Two magnets are sliding towards each other on a smooth surface. Magnet A, which has a mass of 288 g, is moving in the negative x-direction at a speed of 4.8 m/s. Magnet B, which has a mass of 112 g, is moving in the positive x-direction at a speed of 7.8 m/s. When they collide, they join together, and move as a single unit. What is the velocity of this single unit after the collision?
1.3 m/s
5.6 m/s
−1.3 m/s
−5.6 m/s
Recoil collision (reenactment cannon firing)... At a historical re-enactment, a cannon is fired as a demonstration. The projectile fired by the cannon has a mass of 9.7 kg, and the cannon itself has a mass of 1140 kg. If the projectile leaves the cannon with a velocity of 119 m/s eastward, what will be the velocity of the cannon itself after the projectile is fired?
1.0 m/s
2.8 m/s
2.4 m/s
9.0 m/s