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..

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Hubert KochLv2

25 Feb 2019

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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 6.25Â´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 have 5 questions i need the
complete solutions with their final results. is there anyonecouldhelp
me, i would appreciate that.

1)
A 0.12-kg ball is moving at 6 m/s when it is hit by a bat,causingit to reverse direction and have a speed of 14 m/s. What isthechange in the magnitude of the momentum of the ball?

2)

Alex throws a 0.15-kg rubber ball down onto the floor. Theball'sspeed just before impact is 6.5 m/s, and just after is 3.5m/s. Ifthe ball is in contact with the floor for 0.025 s, what isthemagnitude of the average force applied by the floor ontheball?

3)

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?

4)

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:

5)

A machine gun is attached to a railroad flatcar that rollswithnegligible friction. If the railroad car has a mass of 6.25 ?104kg, how many bullets of mass 25 g would have to be fired at 250m/soff the back to give the railroad car a forward velocity of0.5m/s?

thank you in advance

hi,
i have 5 questions i need the complete solutions with theirfinalresults. is there anyone could help me, i wouldappreciatethat.

1)A worker pushes a sled with a force of 40 N over a leveldistanceof 6.0 m. If a frictional force of 24 N acts on thewheelbarrow ina direction opposite to that of the worker, what network is doneon the wheelbarrow?

2) A horizontal force of 200 N is applied to a 55-kg cart acrossa10-m level surface. If the cart accelerates at 2.0 m/s2, thenwhatis the work done by the force of friction as it acts to retardthemotion of the cart?

3) If both mass and velocity of a ball are tripled, thekineticenergy is increased by a factor of:
a) 9, b) 12, c) 3, d) 6

4) A 1 200-kg automobile moving at 25 m/s has the brakesappliedwith a deceleration of 8.0 m/s2. How far does the car travelbeforeit stops?

5) Samantha pushes a 50-N crate up a ramp 25.0 m in lengthandinclined at 10Â° with the horizontal. What potential energychangedoes the crate experience?

thank you in advance

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