A firewoman dropped a person onto the safety net. Right before the person hit the net he had a

velocity of 11.2 m/s and 1800 J of kinetic energy. What was the mass of the person?

The Mass of a person is calculated to be 28.6kg.

Explanation:

This is based on Kinetic energy and we know, that Kinetic energy is the energy possessed by body by virtue of its motion.

It can be calculated by expression:

K. E=1/2mv²

Velocity of a person = 11.2m/sec

Kinetic energy = 1800J

Mass of person = ?

We know,

K. E=1/2mv²

so, putting values we have:

1800=1/2 x m x (11.2) ²

That is,

m=1800 x 2 / 11.2 x 11.2

or

m=3600/125.44

m = 28.6 kg