Peregrine falcons stoop in order to approach prey undetected from above. Suppose a 0.8 kg peregrine falcon dives straight downwards at 90 m/s. It approaches a 0.3 kg pigeon from above and clutches this pigeon in its talons; the two birds move off together in a completely inelastic collision. If the pigeon is initially at rest, what is the downward velocity of the two birds immediately after the collision? If the collision lasts 0.2 s, what is the average force of the collision? For this question you may ignore all forces other than the force of the collision.

A young 45 kg45 kg ice hockey goalie, originally at rest, deflects a 0.14 kg0.14 kg hockey puck slapped at him at a speed of 34.5 m/s34.5 m/s. In this problem, take the original direction of the puck as positive. Suppose the goalie and the hockey puck have an elastic collision and the puck is reflected back in the direction from which it came. What would the final velocity, in meters per second, of the goalie be in this case?

A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?

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A 10.50-g bullet is fired into a stationary block of wood having mass m = 4.980 kg. The bullet imbeds into the block. The speed of the bullet-plus-wood combination immediately after the collision is 0.6090 m/s. What was the original speed of the bullet? (Express your answer with four significant figures.)  m/s

A 3.0-kg object moving in the positive direction of the x-axis has an elastic collision with another of mass 5.0 kg initially at rest. After the collision, the 5.0 kg object has a velocity of 6.0 m / s in the positive x-axis direction. What was the initial speed of the 3.0-kg object?

A green pool ball (p = 30 kg x m/s) moves towards a yellow pool ball (p = -9 kg x m/s).  Then, the two pool balls collide.  After the collision, the green pool ball has a momentum of 3 kg x m/s.   How much momentum does the yellow pool ball have after the collision?  Explain your answer.

Two boxes make a perfectly elastic collision on a horizontal frictionless surface as shown in the figure. Box with mass m= 8.0 kg and speed of 4.50 m/s collides with box M. After the collision, box m recoils with a speed of 0.75 m/s. The boxes are in contact for 0.30 s. The magnitude of the average force on the 8.0 kg box, while the two blocks are in contact, is

If a mass of 1 kg with an initial velocity of 4 m/s to the right collides elastically with a mass of 3 kg going 1 m/s to the left, what will be the velocity of the first mass after the collision? Right is positive, left is negative. Options include: + 1.0 m/s -2.5 m/s -1.5 m/s -3.5 m/s

A 9.7-g bullet is fired into a stationary block of wood having mass m = 5.02 kg. The bullet imbeds into the block. The speed of the bullet-plus-wood combination immediately after the collision is 0.603 m/s. What was the original speed of the bullet? (Express your answer with four significant figures.)