An object with a speed of 20.meters per second has a kinetic energy of 400. J. The mass of the object is
A .1.0 kg
B. 2.0 kg
C. 0.50 kg
D. 40 kg

explain why

Option B. 2.0 kg

Explanation:

Data obtained from the question include:

V = 20m/s

K.E = 400J

m =?

K.E = 1/2 mV^2

400 = 1/2 x m x (20)^2

400 = 1/2 x m x 400

400 = m x 200

Divide both side by 200

m = 400/200

m = 2kg

The mass of the object is 2kg

the entire statement is true and correct.  

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