Homework Help: physics- PLEASE HELP

Posted by kim on Wednesday, December 3, 2008 at 10:53pm.

2. A .12 kg ball is moving at 6 m/s when it is hit by a bat, causing it to reverse direction and have a speed of 14 m/s. What is the change in the magnitude of the momentum of the ball?

4. Lonnie pitches a baseball of mass .2 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for .050 s, what is the impulse experienced by the ball?

physics- PLEASE HELP - drwls, Thursday, December 4, 2008 at 2:30am
2. Although the momentum changes by 0.12 kg * [6 -(-14)m/s]= 2.4 kg m/s, becasue the direction reverses, the MAGNITUDE of the momentum changes only by 0.12 kg*(14 - 6)m/s = 0.72 kg m/s

4. Compute the momentum change, taking into account the direction change. That will equal the impulse. Divide that by the time interval of contact to get the average force.

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