Kinetic energy is defined as the energy possessed by an object by virtue of its motion.
Step 2 :
Formula:
K.E = 1/2 * mv2. Joules
State the equation you plan to use and plug in the values.
Given that the displacement of body in meters is a function of time as follows : x = 3t2+ 6.The mass of the body is 4 kg.What is the increase in its kinetic energy two second after start of the motion ?
Step 1 :Velocity v=dx/dt=d/dx (2t2+ 6) =4t.
After two second the velocity is 4(2) = 8 m/s.
Step 2 :Formula:
K.E = 1/2 * mv2. Joules
Where m = 4 kg and v = 8 m/s.
K.E = 1/2 * 4 *82.
Answer :K.E = 128 Joules.
The displacement of body,whose velocity is 3 m/s .The mass of the body is 4 kg.What is the kinetic energy of the motion ?
Step 1 :Formula:
K.E = 1/2 * mv2. Joules
Where m = 4 kg and v = 3 m/s.
Step 2 :Plug in the values in the above equation.
K.E = 1/2 * 4 *32.
Answer :K.E = 32 Joules.
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