GGRA02H3 Lecture 8: Lecture #8-Migration

hi,

i need help please, i have 2 questions i need theircompletesolutions



1)

A 20-kg object sitting at rest is struck elastically in ahead-oncollision with a 10-kg object initially moving at +3.0 m/s.Findthe final velocity of the 20-kg object after thecollision.



2)

A 7.0-kg bowling ball strikes a 2.0-kg pin. The pin fliesforwardwith a velocity of 6.0 m/s; the ball continues forward at4.0 m/s.What was the original velocity of the ball?



thanks in advance..

hi,
i need help please, i have 2 questions i need theircompletesolutions

1)
A machine gun is attached to a railroad flatcar that rollswithnegligible friction. If the railroad car has a mass of 6.25´104 kg, how many bullets of mass 25 g would have to be fired at250m/s off the back to give the railroad car a forward velocity of0.5m/s?

2)
A 2 500-kg truck moving at 10.00 m/s strikes a car waiting atatraffic light, hooking bumpers. The two continue to movetogetherat 7.00 m/s. What was the mass of the struck car?

thanks in advance..

hi,
i need help please, i have 2 questions i need theircompletesolutions

1)
Lonnie pitches a baseball of mass 0.20 kg. The ball arrives athomeplate with a speed of 40 m/s and is batted straight back toLonniewith a return speed of 60 m/s. If the bat is in contact withtheball for 0.050 s, what is the impulse experienced by theball?

2)
A ball with original momentum +4.0 kg×m/s hits a wall andbouncesstraight back without losing any kinetic energy. The changeinmomentum of the ball is:

thanks in advance..