On a touchdown attempt, a 95.0-kg running back runs toward the end zone at 3.75 m>s. A 111-kg linebacker moving at4.10 m>s meets the runner in a head-on collision. If the two players stick together, (a) what is their velocity immediatelyafter the collision? (b) What are the initial and final kinetic energies of the system?

A 44.0-kg boy, riding a 2.80-kg skateboard at a velocity of 5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 7.60° above the horizontal. Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer. Number i Units Vo V12 The

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Two football players collide head-on in midair, moving along the same horizontal direction, while trying to catch a thrown football. The first player is 91 kg and has an initial velocity of 6.1 m/s (in the positive direction), while the second player is 115.5 kg and has an initial velocity of –3.65 m/s. What is their velocity in the horizontal direction just after impact if they cling together, in meters per second? vf =