What is the kinetic energy of a 1000kg van moving at 20m/s? Show your solution
Answers
Answer:
A 1,000 kg car is traveling at 20 m/s. How much kinetic energy does it have at that speed?
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Here’s a second way to come up with the answer. As shown by Jerry Han Jia Tao, KE = work done = F * s, or force acting through a displacement. In mks units, the unit of force is the newton (nt), defined as the force needed to accelerate a mass of 1 kgm by 1 m/sec^2, and the unit of energy, the joule, is the KE of 1 nt acting through 1 meter of distance (1 nt-m = 1 J). So if we have 1000 nt of force being applied, it will accelerate the 1000 kgm car by 1 m/sec^2, and after 20 seconds, the car will be going 20 m/s. Its average velocity will be 1/2 its final (since it started from rest and its speed increased at a uniform rate), or 10 m/s, so it will have traveled 200 meters over this 20 seconds. Thus the KE is 1000 nt * 200 m = 200,000
Answer:
- Kinetic energy is form of energy that an object or particle has by reason of motion.
- Energy has been transfered to object when work has been done.
- Example of kinetic energy are : falling, flying , walking, throwing etc.
Formula of kinetic energy : 1/2 MV²
Mass of van : 1000kg =(m)
Velocity of the van =20m/s(v)
Therefore We know that :
K.E = 1/2MV²
K.E.= 1/2 ×1000×(20)²
=1/2 ×1000×400
= 2,00,000kg m²/s⁴
= 200KJ
∴ Kinetic energy of van is 200KJ
Explanation: