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4. An 85 kg object has 2.16 x 10 J of kinetic energy. What is the object's velocity?​

Sagot :

Answer:

v = 0.713[m/s]

Explanation:

Kinetic energy is defined as the product of mass by the squared velocity of a body. In this way with the following expression we can have the kinetic energy as a function of velocity.

[tex]E_{kin}=0.5*m*v^{2}[/tex]

where:

m = mass = 85 [kg]

v = velocity [m/s]

Ekin = kinetic energy = 2.16*10 [J]

[tex]2.16*10 = 0.5*85*v^{2}\\v =\sqrt{0.508} \\v= 0.713[m/s][/tex]