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From the calculations that we carried out, the mass of the body is 9.5 x 10^6 Kg.
Kinetic energy is the product of mass and velocity. The kinetic energy of a body is the energy possessed owing to the motion of the body.
Given that;
KE = 1/2 mv^2
KE = kinetic energy
m = mass
v = velocity
m = 2KE/v^2
m = 2 * 2.78 x 10^10 J/( 76.4 m/s)^2
m = 9.5 x 10^6 Kg
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