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4 years ago

Solve the problems and show your work please and the formulas are at the top to use each one

Physics

1 answer:

sweet-ann [11.9K]4 years ago

7 0

1) The momentum of the object is 1000 kg m/s

2) The force exerted on the wall is 20,000 N

Explanation:

The momentum of an object is defined as

$p=mv$

where

m is the mass of the object

v is its velocity

For the object in this problem, we have

m = 50 kg is its mass

v = 20 m/s is the velocity

Substutiting, we find the momentum

$p=(50)(20)=1000 kg m/s$

For this part of the problem, we can use the impulse theorem, which states that the impulse exerted on an object (the product between force and time of collision) is equal to the change in momentum of the object:

$Ft = m \Delta v$

where

F is the force on the object

t is the duration of the collision

m is the mass

$\Delta v$ is the change in velocity of the object

Here we have:

m = 5000 kg

$\Delta v = -40 m/s$ (the car decelerates from 40 m/s to a stop)

t = 10 s

Solving, we find the force exerted on the car:

$F=\frac{m\Delta v}{t}=\frac{(5000)(-40)}{10}=-20,000 N$

where the negative sign means the direction of the force is opposite to that of motion of the car. However, here we are asked to find the force exerted by the car on the wall: according to Newton's third law, that force will be equal and opposite to the force exerted by the wall on the car, so

F = 20,000 N

Learn more about momentum here:

brainly.com/question/7973509

brainly.com/question/6573742

brainly.com/question/2370982

brainly.com/question/9484203

#LearnwithBrainly

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Solve the problems and show your work please and the formulas are at the top to use each one ​

Solve the problems and show your work please and the formulas are at the top to use each one