Kinetic Energy in Joules of an Object

AI Thread Summary
The kinetic energy of a car traveling at 60 miles per hour with a mass of 800 kg is calculated using the formula KE = 1/2 m * v². Converting the speed to meters per second gives approximately 26.82 m/s. The calculation results in a kinetic energy of 287,724 Joules. The poster expresses difficulty with the physics course, which was recommended as an easy option for business majors. Assistance and validation of the solution are requested.
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Homework Statement


A car is traveling at a constant 60 miles per hour. What is its kinetic energy in Joules if its mass is 800 kg?


Homework Equations


KE = 1/2m * v2 (?)


The Attempt at a Solution


½(800kg)*(26.82 m/s)2 = 287,724 kg * m2/s2 = 287,724 J

I hope that looks right. I'm a business major and my advisor suggested this Physics class as "easy" for business majors. So far its not going so well. LOL Any help someone can offer on my solution would be great. Thanks.
 
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Looks OK to me.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...

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