A rugby player with a mass of 126 kg and a velocity of 5.5 m s-1 tackles an opposition player who has the ball. The player with the ball has a mass of 94 kg and a velocity of -4 m s-1. Both players stay on their feet and the player with the ball is pushed backwards by the tackler. Calculate the initial velocity of the player with the ball when he is moving backwards as a result of the tackle.

Show complete Solution. 1.) A man fires a target 420 m away hears the bullet strikes to 2 second after he pulled the trigger. An observer 525 m away from the target and 455 m from the man heard the bullet strike the target one second after he heard the report of the rifle. Find the velocity of the bullet. (Ans: 525 m/s) 2.) A man travels in a motorized banca at rate of 12 kph from his barrio to the poblacion and come back to his barrio at the rate of 10 kph. If his total time of travel back and forth is 3 hours and 10 minutes, the distance from the barrio to the poblacion is : (Ans: 17.27 km)    3.) Two ferryboats ply back and forth across a river with constant but different speeds, turning at the river banks without loss of time. They leave the opposite shores at the same instant, meet for the first time 900 meters from one shore, and meet for the second time 500 meters from the opposite shore. What is the width of the river? (Ans: 2200 m)

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Terhyon throws throws a football to Javon. The throw lasts for 4 seconds and reaches a maximum velocity of 40m/s. Calculate the acceleration of the football.