How can I calculate the joules for speeding objects?

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To calculate the energy of a speeding object, the primary formula used is kinetic energy (KE = 1/2mv²), where m is mass in kilograms and v is speed in meters per second. The discussion highlights a scenario involving an object traveling at Mach 7 for 20,000 feet with a weight of 2,000 lbs. It is clarified that an object moving at a constant speed is not accelerating, which is an important distinction in energy calculations. Additional equations for accelerating objects were mentioned, but the focus remains on the kinetic energy formula for constant speed scenarios. Understanding these formulas is essential for accurately calculating energy in various motion contexts.
promeus
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Ok,lets say an object is moving at a constant speed of Mach 7 for 20000ft. The weight for the object is 2000 lbs.

What formulas could I use to calculate the energy for accelerating objects,or this one in particular?
 
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The formula for kinetic energy is KE = 1/2mv2.

m = mass, in kg
v = speed, in m/s

KE = kinetic energy, in joules
 
promeus said:
Ok,lets say an object is moving at a constant speed of Mach 7 for 20000ft. The weight for the object is 2000 lbs.

What formulas could I use to calculate the energy for accelerating objects,or this one in particular?
By the way, something moving at constant speed is not accelerating!
 
Thank you I just realized my error,but I was asking for general equations when I said "accelerating objects".
 
KE = .5m(v0^2) + mas = .5m(v0^2) + Fs = .5m(v0^2) + F(v0t + .5(a)(t^2)) ?
 

Thread 'Mousetrap Car Energy efficiency'

For simple comparison, I think the same thought process can be followed as a block slides down a hill, - for block down hill, simple starting PE of mgh to final max KE 0.5mv^2 - comparing PE1 to max KE2 would result in finding the work friction did through the process. efficiency is just 100*KE2/PE1. If a mousetrap car travels along a flat surface, a starting PE of 0.5 k th^2 can be measured and maximum velocity of the car can also be measured. If energy efficiency is defined by...
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