# Assignment on Physics Numerical Problem Homework Help

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### Question Description

I am attaching two files with 21 questions in total. I got some of them worked out, not sure if they are correct, please help me checking them and solve the other ones. Thank you.

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Aljon2017
School: University of Virginia

Hi, I'm sending HW 1 first...

SOLUTION:
m = 3300 lb x (1 kg / 2.20 lb) = 1500 kg
KEf = 0 (since the car is on a stop)
W = Fd = (6000 N)(60 m) = 360000 J
We can compute the deceleration of the object as follows:
F = ma
a = F/m = 6000 N / 1500 kg
a = 4 m/s2
since the car is decelerating, acceleration has a negative sign and is equal to -4 m/s2
We can compute for the initial velocity using the following relationship:
0 = v02 + 2(-4 m/s2)(60 m)
v02 = 480 m2/s2
v0 = 21.9 m/s
KE0 = ½ mv02 = ½ (1500 kg)(480 m2/s2)
KE0 = 360000 J
ΔKE = KEf – KE0 = 0 – 360000 J

ΔKE = -360000 J

SOLUTION:
Case 1: M = mv = (1 kg)(2 m/s) = 2 kg∙m/s
Case 2: M = mv = (2 kg)(1 m/s) = 2 kg∙m/s
They have the same momentum

SOLUTION:
Case ...

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Anonymous
Thanks, good work

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